Expr.h revision aee3c9375f97a49edef2a36f15df6abd9748e2a1
1//===--- Expr.h - Classes for representing expressions ----------*- C++ -*-===// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file defines the Expr interface and subclasses. 11// 12//===----------------------------------------------------------------------===// 13 14#ifndef LLVM_CLANG_AST_EXPR_H 15#define LLVM_CLANG_AST_EXPR_H 16 17#include "clang/AST/APValue.h" 18#include "clang/AST/Stmt.h" 19#include "clang/AST/Type.h" 20#include "llvm/ADT/APSInt.h" 21#include "llvm/ADT/APFloat.h" 22#include "llvm/ADT/SmallVector.h" 23#include "llvm/ADT/StringRef.h" 24#include <vector> 25 26namespace clang { 27 class ASTContext; 28 class APValue; 29 class Decl; 30 class IdentifierInfo; 31 class ParmVarDecl; 32 class NamedDecl; 33 class ValueDecl; 34 class BlockDecl; 35 class CXXOperatorCallExpr; 36 class CXXMemberCallExpr; 37 38/// Expr - This represents one expression. Note that Expr's are subclasses of 39/// Stmt. This allows an expression to be transparently used any place a Stmt 40/// is required. 41/// 42class Expr : public Stmt { 43 QualType TR; 44 45protected: 46 /// TypeDependent - Whether this expression is type-dependent 47 /// (C++ [temp.dep.expr]). 48 bool TypeDependent : 1; 49 50 /// ValueDependent - Whether this expression is value-dependent 51 /// (C++ [temp.dep.constexpr]). 52 bool ValueDependent : 1; 53 54 // FIXME: Eventually, this constructor should go away and we should 55 // require every subclass to provide type/value-dependence 56 // information. 57 Expr(StmtClass SC, QualType T) 58 : Stmt(SC), TypeDependent(false), ValueDependent(false) { 59 setType(T); 60 } 61 62 Expr(StmtClass SC, QualType T, bool TD, bool VD) 63 : Stmt(SC), TypeDependent(TD), ValueDependent(VD) { 64 setType(T); 65 } 66 67 /// \brief Construct an empty expression. 68 explicit Expr(StmtClass SC, EmptyShell) : Stmt(SC) { } 69 70public: 71 /// \brief Increases the reference count for this expression. 72 /// 73 /// Invoke the Retain() operation when this expression 74 /// is being shared by another owner. 75 Expr *Retain() { 76 Stmt::Retain(); 77 return this; 78 } 79 80 QualType getType() const { return TR; } 81 void setType(QualType t) { 82 // In C++, the type of an expression is always adjusted so that it 83 // will not have reference type an expression will never have 84 // reference type (C++ [expr]p6). Use 85 // QualType::getNonReferenceType() to retrieve the non-reference 86 // type. Additionally, inspect Expr::isLvalue to determine whether 87 // an expression that is adjusted in this manner should be 88 // considered an lvalue. 89 assert((TR.isNull() || !TR->isReferenceType()) && 90 "Expressions can't have reference type"); 91 92 TR = t; 93 } 94 95 /// isValueDependent - Determines whether this expression is 96 /// value-dependent (C++ [temp.dep.constexpr]). For example, the 97 /// array bound of "Chars" in the following example is 98 /// value-dependent. 99 /// @code 100 /// template<int Size, char (&Chars)[Size]> struct meta_string; 101 /// @endcode 102 bool isValueDependent() const { return ValueDependent; } 103 104 /// \brief Set whether this expression is value-dependent or not. 105 void setValueDependent(bool VD) { ValueDependent = VD; } 106 107 /// isTypeDependent - Determines whether this expression is 108 /// type-dependent (C++ [temp.dep.expr]), which means that its type 109 /// could change from one template instantiation to the next. For 110 /// example, the expressions "x" and "x + y" are type-dependent in 111 /// the following code, but "y" is not type-dependent: 112 /// @code 113 /// template<typename T> 114 /// void add(T x, int y) { 115 /// x + y; 116 /// } 117 /// @endcode 118 bool isTypeDependent() const { return TypeDependent; } 119 120 /// \brief Set whether this expression is type-dependent or not. 121 void setTypeDependent(bool TD) { TypeDependent = TD; } 122 123 /// SourceLocation tokens are not useful in isolation - they are low level 124 /// value objects created/interpreted by SourceManager. We assume AST 125 /// clients will have a pointer to the respective SourceManager. 126 virtual SourceRange getSourceRange() const = 0; 127 128 /// getExprLoc - Return the preferred location for the arrow when diagnosing 129 /// a problem with a generic expression. 130 virtual SourceLocation getExprLoc() const { return getLocStart(); } 131 132 /// isUnusedResultAWarning - Return true if this immediate expression should 133 /// be warned about if the result is unused. If so, fill in Loc and Ranges 134 /// with location to warn on and the source range[s] to report with the 135 /// warning. 136 bool isUnusedResultAWarning(SourceLocation &Loc, SourceRange &R1, 137 SourceRange &R2) const; 138 139 /// isLvalue - C99 6.3.2.1: an lvalue is an expression with an object type or 140 /// incomplete type other than void. Nonarray expressions that can be lvalues: 141 /// - name, where name must be a variable 142 /// - e[i] 143 /// - (e), where e must be an lvalue 144 /// - e.name, where e must be an lvalue 145 /// - e->name 146 /// - *e, the type of e cannot be a function type 147 /// - string-constant 148 /// - reference type [C++ [expr]] 149 /// - b ? x : y, where x and y are lvalues of suitable types [C++] 150 /// 151 enum isLvalueResult { 152 LV_Valid, 153 LV_NotObjectType, 154 LV_IncompleteVoidType, 155 LV_DuplicateVectorComponents, 156 LV_InvalidExpression, 157 LV_MemberFunction 158 }; 159 isLvalueResult isLvalue(ASTContext &Ctx) const; 160 161 // Same as above, but excluding checks for non-object and void types in C 162 isLvalueResult isLvalueInternal(ASTContext &Ctx) const; 163 164 /// isModifiableLvalue - C99 6.3.2.1: an lvalue that does not have array type, 165 /// does not have an incomplete type, does not have a const-qualified type, 166 /// and if it is a structure or union, does not have any member (including, 167 /// recursively, any member or element of all contained aggregates or unions) 168 /// with a const-qualified type. 169 /// 170 /// \param Loc [in] [out] - A source location which *may* be filled 171 /// in with the location of the expression making this a 172 /// non-modifiable lvalue, if specified. 173 enum isModifiableLvalueResult { 174 MLV_Valid, 175 MLV_NotObjectType, 176 MLV_IncompleteVoidType, 177 MLV_DuplicateVectorComponents, 178 MLV_InvalidExpression, 179 MLV_LValueCast, // Specialized form of MLV_InvalidExpression. 180 MLV_IncompleteType, 181 MLV_ConstQualified, 182 MLV_ArrayType, 183 MLV_NotBlockQualified, 184 MLV_ReadonlyProperty, 185 MLV_NoSetterProperty, 186 MLV_MemberFunction 187 }; 188 isModifiableLvalueResult isModifiableLvalue(ASTContext &Ctx, 189 SourceLocation *Loc = 0) const; 190 191 /// \brief If this expression refers to a bit-field, retrieve the 192 /// declaration of that bit-field. 193 FieldDecl *getBitField(); 194 195 const FieldDecl *getBitField() const { 196 return const_cast<Expr*>(this)->getBitField(); 197 } 198 199 /// isIntegerConstantExpr - Return true if this expression is a valid integer 200 /// constant expression, and, if so, return its value in Result. If not a 201 /// valid i-c-e, return false and fill in Loc (if specified) with the location 202 /// of the invalid expression. 203 bool isIntegerConstantExpr(llvm::APSInt &Result, ASTContext &Ctx, 204 SourceLocation *Loc = 0, 205 bool isEvaluated = true) const; 206 bool isIntegerConstantExpr(ASTContext &Ctx, SourceLocation *Loc = 0) const { 207 llvm::APSInt X; 208 return isIntegerConstantExpr(X, Ctx, Loc); 209 } 210 /// isConstantInitializer - Returns true if this expression is a constant 211 /// initializer, which can be emitted at compile-time. 212 bool isConstantInitializer(ASTContext &Ctx) const; 213 214 /// EvalResult is a struct with detailed info about an evaluated expression. 215 struct EvalResult { 216 /// Val - This is the value the expression can be folded to. 217 APValue Val; 218 219 /// HasSideEffects - Whether the evaluated expression has side effects. 220 /// For example, (f() && 0) can be folded, but it still has side effects. 221 bool HasSideEffects; 222 223 /// Diag - If the expression is unfoldable, then Diag contains a note 224 /// diagnostic indicating why it's not foldable. DiagLoc indicates a caret 225 /// position for the error, and DiagExpr is the expression that caused 226 /// the error. 227 /// If the expression is foldable, but not an integer constant expression, 228 /// Diag contains a note diagnostic that describes why it isn't an integer 229 /// constant expression. If the expression *is* an integer constant 230 /// expression, then Diag will be zero. 231 unsigned Diag; 232 const Expr *DiagExpr; 233 SourceLocation DiagLoc; 234 235 EvalResult() : HasSideEffects(false), Diag(0), DiagExpr(0) {} 236 }; 237 238 /// Evaluate - Return true if this is a constant which we can fold using 239 /// any crazy technique (that has nothing to do with language standards) that 240 /// we want to. If this function returns true, it returns the folded constant 241 /// in Result. 242 bool Evaluate(EvalResult &Result, ASTContext &Ctx) const; 243 244 /// EvaluateAsAny - The same as Evaluate, except that it also succeeds on 245 /// stack based objects. 246 bool EvaluateAsAny(EvalResult &Result, ASTContext &Ctx) const; 247 248 /// isEvaluatable - Call Evaluate to see if this expression can be constant 249 /// folded, but discard the result. 250 bool isEvaluatable(ASTContext &Ctx) const; 251 252 /// EvaluateAsInt - Call Evaluate and return the folded integer. This 253 /// must be called on an expression that constant folds to an integer. 254 llvm::APSInt EvaluateAsInt(ASTContext &Ctx) const; 255 256 /// EvaluateAsLValue - Evaluate an expression to see if it's a lvalue 257 /// with link time known address. 258 bool EvaluateAsLValue(EvalResult &Result, ASTContext &Ctx) const; 259 260 /// EvaluateAsAnyLValue - The same as EvaluateAsLValue, except that it 261 /// also succeeds on stack based, immutable address lvalues. 262 bool EvaluateAsAnyLValue(EvalResult &Result, ASTContext &Ctx) const; 263 264 /// \brief Enumeration used to describe how \c isNullPointerConstant() 265 /// should cope with value-dependent expressions. 266 enum NullPointerConstantValueDependence { 267 /// \brief Specifies that the expression should never be value-dependent. 268 NPC_NeverValueDependent = 0, 269 270 /// \brief Specifies that a value-dependent expression of integral or 271 /// dependent type should be considered a null pointer constant. 272 NPC_ValueDependentIsNull, 273 274 /// \brief Specifies that a value-dependent expression should be considered 275 /// to never be a null pointer constant. 276 NPC_ValueDependentIsNotNull 277 }; 278 279 /// isNullPointerConstant - C99 6.3.2.3p3 - Return true if this is either an 280 /// integer constant expression with the value zero, or if this is one that is 281 /// cast to void*. 282 bool isNullPointerConstant(ASTContext &Ctx, 283 NullPointerConstantValueDependence NPC) const; 284 285 /// isOBJCGCCandidate - Return true if this expression may be used in a read/ 286 /// write barrier. 287 bool isOBJCGCCandidate(ASTContext &Ctx) const; 288 289 /// IgnoreParens - Ignore parentheses. If this Expr is a ParenExpr, return 290 /// its subexpression. If that subexpression is also a ParenExpr, 291 /// then this method recursively returns its subexpression, and so forth. 292 /// Otherwise, the method returns the current Expr. 293 Expr* IgnoreParens(); 294 295 /// IgnoreParenCasts - Ignore parentheses and casts. Strip off any ParenExpr 296 /// or CastExprs, returning their operand. 297 Expr *IgnoreParenCasts(); 298 299 /// IgnoreParenNoopCasts - Ignore parentheses and casts that do not change the 300 /// value (including ptr->int casts of the same size). Strip off any 301 /// ParenExpr or CastExprs, returning their operand. 302 Expr *IgnoreParenNoopCasts(ASTContext &Ctx); 303 304 const Expr* IgnoreParens() const { 305 return const_cast<Expr*>(this)->IgnoreParens(); 306 } 307 const Expr *IgnoreParenCasts() const { 308 return const_cast<Expr*>(this)->IgnoreParenCasts(); 309 } 310 const Expr *IgnoreParenNoopCasts(ASTContext &Ctx) const { 311 return const_cast<Expr*>(this)->IgnoreParenNoopCasts(Ctx); 312 } 313 314 static bool hasAnyTypeDependentArguments(Expr** Exprs, unsigned NumExprs); 315 static bool hasAnyValueDependentArguments(Expr** Exprs, unsigned NumExprs); 316 317 static bool classof(const Stmt *T) { 318 return T->getStmtClass() >= firstExprConstant && 319 T->getStmtClass() <= lastExprConstant; 320 } 321 static bool classof(const Expr *) { return true; } 322}; 323 324 325//===----------------------------------------------------------------------===// 326// Primary Expressions. 327//===----------------------------------------------------------------------===// 328 329/// \brief Represents the qualifier that may precede a C++ name, e.g., the 330/// "std::" in "std::sort". 331struct NameQualifier { 332 /// \brief The nested name specifier. 333 NestedNameSpecifier *NNS; 334 335 /// \brief The source range covered by the nested name specifier. 336 SourceRange Range; 337}; 338 339/// \brief Represents an explicit template argument list in C++, e.g., 340/// the "<int>" in "sort<int>". 341struct ExplicitTemplateArgumentList { 342 /// \brief The source location of the left angle bracket ('<'); 343 SourceLocation LAngleLoc; 344 345 /// \brief The source location of the right angle bracket ('>'); 346 SourceLocation RAngleLoc; 347 348 /// \brief The number of template arguments in TemplateArgs. 349 /// The actual template arguments (if any) are stored after the 350 /// ExplicitTemplateArgumentList structure. 351 unsigned NumTemplateArgs; 352 353 /// \brief Retrieve the template arguments 354 TemplateArgument *getTemplateArgs() { 355 return reinterpret_cast<TemplateArgument *> (this + 1); 356 } 357 358 /// \brief Retrieve the template arguments 359 const TemplateArgument *getTemplateArgs() const { 360 return reinterpret_cast<const TemplateArgument *> (this + 1); 361 } 362}; 363 364/// DeclRefExpr - [C99 6.5.1p2] - A reference to a declared variable, function, 365/// enum, etc. 366class DeclRefExpr : public Expr { 367 enum { 368 // Flag on DecoratedD that specifies when this declaration reference 369 // expression has a C++ nested-name-specifier. 370 HasQualifierFlag = 0x01, 371 // Flag on DecoratedD that specifies when this declaration reference 372 // expression has an explicit C++ template argument list. 373 HasExplicitTemplateArgumentListFlag = 0x02 374 }; 375 376 // DecoratedD - The declaration that we are referencing, plus two bits to 377 // indicate whether (1) the declaration's name was explicitly qualified and 378 // (2) the declaration's name was followed by an explicit template 379 // argument list. 380 llvm::PointerIntPair<NamedDecl *, 2> DecoratedD; 381 382 // Loc - The location of the declaration name itself. 383 SourceLocation Loc; 384 385 /// \brief Retrieve the qualifier that preceded the declaration name, if any. 386 NameQualifier *getNameQualifier() { 387 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 388 return 0; 389 390 return reinterpret_cast<NameQualifier *> (this + 1); 391 } 392 393 /// \brief Retrieve the qualifier that preceded the member name, if any. 394 const NameQualifier *getNameQualifier() const { 395 return const_cast<DeclRefExpr *>(this)->getNameQualifier(); 396 } 397 398 /// \brief Retrieve the explicit template argument list that followed the 399 /// member template name, if any. 400 ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() { 401 if ((DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag) == 0) 402 return 0; 403 404 if ((DecoratedD.getInt() & HasQualifierFlag) == 0) 405 return reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 406 407 return reinterpret_cast<ExplicitTemplateArgumentList *>( 408 getNameQualifier() + 1); 409 } 410 411 /// \brief Retrieve the explicit template argument list that followed the 412 /// member template name, if any. 413 const ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() const { 414 return const_cast<DeclRefExpr *>(this)->getExplicitTemplateArgumentList(); 415 } 416 417 DeclRefExpr(NestedNameSpecifier *Qualifier, SourceRange QualifierRange, 418 NamedDecl *D, SourceLocation NameLoc, 419 bool HasExplicitTemplateArgumentList, 420 SourceLocation LAngleLoc, 421 const TemplateArgument *ExplicitTemplateArgs, 422 unsigned NumExplicitTemplateArgs, 423 SourceLocation RAngleLoc, 424 QualType T, bool TD, bool VD); 425 426protected: 427 // FIXME: Eventually, this constructor will go away and all subclasses 428 // will have to provide the type- and value-dependent flags. 429 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l) : 430 Expr(SC, t), DecoratedD(d, 0), Loc(l) {} 431 432 DeclRefExpr(StmtClass SC, NamedDecl *d, QualType t, SourceLocation l, bool TD, 433 bool VD) : 434 Expr(SC, t, TD, VD), DecoratedD(d, 0), Loc(l) {} 435 436public: 437 // FIXME: Eventually, this constructor will go away and all clients 438 // will have to provide the type- and value-dependent flags. 439 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l) : 440 Expr(DeclRefExprClass, t), DecoratedD(d, 0), Loc(l) {} 441 442 DeclRefExpr(NamedDecl *d, QualType t, SourceLocation l, bool TD, bool VD) : 443 Expr(DeclRefExprClass, t, TD, VD), DecoratedD(d, 0), Loc(l) {} 444 445 /// \brief Construct an empty declaration reference expression. 446 explicit DeclRefExpr(EmptyShell Empty) 447 : Expr(DeclRefExprClass, Empty) { } 448 449 static DeclRefExpr *Create(ASTContext &Context, 450 NestedNameSpecifier *Qualifier, 451 SourceRange QualifierRange, 452 NamedDecl *D, 453 SourceLocation NameLoc, 454 QualType T, bool TD, bool VD); 455 456 static DeclRefExpr *Create(ASTContext &Context, 457 NestedNameSpecifier *Qualifier, 458 SourceRange QualifierRange, 459 NamedDecl *D, 460 SourceLocation NameLoc, 461 bool HasExplicitTemplateArgumentList, 462 SourceLocation LAngleLoc, 463 const TemplateArgument *ExplicitTemplateArgs, 464 unsigned NumExplicitTemplateArgs, 465 SourceLocation RAngleLoc, 466 QualType T, bool TD, bool VD); 467 468 NamedDecl *getDecl() { return DecoratedD.getPointer(); } 469 const NamedDecl *getDecl() const { return DecoratedD.getPointer(); } 470 void setDecl(NamedDecl *NewD) { DecoratedD.setPointer(NewD); } 471 472 SourceLocation getLocation() const { return Loc; } 473 void setLocation(SourceLocation L) { Loc = L; } 474 virtual SourceRange getSourceRange() const; 475 476 /// \brief Determine whether this declaration reference was preceded by a 477 /// C++ nested-name-specifier, e.g., \c N::foo. 478 bool hasQualifier() const { return DecoratedD.getInt() & HasQualifierFlag; } 479 480 /// \brief If the name was qualified, retrieves the source range of 481 /// the nested-name-specifier that precedes the name. Otherwise, 482 /// returns an empty source range. 483 SourceRange getQualifierRange() const { 484 if (!hasQualifier()) 485 return SourceRange(); 486 487 return getNameQualifier()->Range; 488 } 489 490 /// \brief If the name was qualified, retrieves the nested-name-specifier 491 /// that precedes the name. Otherwise, returns NULL. 492 NestedNameSpecifier *getQualifier() const { 493 if (!hasQualifier()) 494 return 0; 495 496 return getNameQualifier()->NNS; 497 } 498 499 /// \brief Determines whether this member expression actually had a C++ 500 /// template argument list explicitly specified, e.g., x.f<int>. 501 bool hasExplicitTemplateArgumentList() const { 502 return DecoratedD.getInt() & HasExplicitTemplateArgumentListFlag; 503 } 504 505 /// \brief Retrieve the location of the left angle bracket following the 506 /// member name ('<'), if any. 507 SourceLocation getLAngleLoc() const { 508 if (!hasExplicitTemplateArgumentList()) 509 return SourceLocation(); 510 511 return getExplicitTemplateArgumentList()->LAngleLoc; 512 } 513 514 /// \brief Retrieve the template arguments provided as part of this 515 /// template-id. 516 const TemplateArgument *getTemplateArgs() const { 517 if (!hasExplicitTemplateArgumentList()) 518 return 0; 519 520 return getExplicitTemplateArgumentList()->getTemplateArgs(); 521 } 522 523 /// \brief Retrieve the number of template arguments provided as part of this 524 /// template-id. 525 unsigned getNumTemplateArgs() const { 526 if (!hasExplicitTemplateArgumentList()) 527 return 0; 528 529 return getExplicitTemplateArgumentList()->NumTemplateArgs; 530 } 531 532 /// \brief Retrieve the location of the right angle bracket following the 533 /// template arguments ('>'). 534 SourceLocation getRAngleLoc() const { 535 if (!hasExplicitTemplateArgumentList()) 536 return SourceLocation(); 537 538 return getExplicitTemplateArgumentList()->RAngleLoc; 539 } 540 541 static bool classof(const Stmt *T) { 542 return T->getStmtClass() == DeclRefExprClass || 543 T->getStmtClass() == CXXConditionDeclExprClass; 544 } 545 static bool classof(const DeclRefExpr *) { return true; } 546 547 // Iterators 548 virtual child_iterator child_begin(); 549 virtual child_iterator child_end(); 550}; 551 552/// PredefinedExpr - [C99 6.4.2.2] - A predefined identifier such as __func__. 553class PredefinedExpr : public Expr { 554public: 555 enum IdentType { 556 Func, 557 Function, 558 PrettyFunction 559 }; 560 561private: 562 SourceLocation Loc; 563 IdentType Type; 564public: 565 PredefinedExpr(SourceLocation l, QualType type, IdentType IT) 566 : Expr(PredefinedExprClass, type, type->isDependentType(), 567 type->isDependentType()), Loc(l), Type(IT) {} 568 569 /// \brief Construct an empty predefined expression. 570 explicit PredefinedExpr(EmptyShell Empty) 571 : Expr(PredefinedExprClass, Empty) { } 572 573 IdentType getIdentType() const { return Type; } 574 void setIdentType(IdentType IT) { Type = IT; } 575 576 SourceLocation getLocation() const { return Loc; } 577 void setLocation(SourceLocation L) { Loc = L; } 578 579 static std::string ComputeName(ASTContext &Context, IdentType IT, 580 const Decl *CurrentDecl); 581 582 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 583 584 static bool classof(const Stmt *T) { 585 return T->getStmtClass() == PredefinedExprClass; 586 } 587 static bool classof(const PredefinedExpr *) { return true; } 588 589 // Iterators 590 virtual child_iterator child_begin(); 591 virtual child_iterator child_end(); 592}; 593 594class IntegerLiteral : public Expr { 595 llvm::APInt Value; 596 SourceLocation Loc; 597public: 598 // type should be IntTy, LongTy, LongLongTy, UnsignedIntTy, UnsignedLongTy, 599 // or UnsignedLongLongTy 600 IntegerLiteral(const llvm::APInt &V, QualType type, SourceLocation l) 601 : Expr(IntegerLiteralClass, type), Value(V), Loc(l) { 602 assert(type->isIntegerType() && "Illegal type in IntegerLiteral"); 603 } 604 605 /// \brief Construct an empty integer literal. 606 explicit IntegerLiteral(EmptyShell Empty) 607 : Expr(IntegerLiteralClass, Empty) { } 608 609 const llvm::APInt &getValue() const { return Value; } 610 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 611 612 /// \brief Retrieve the location of the literal. 613 SourceLocation getLocation() const { return Loc; } 614 615 void setValue(const llvm::APInt &Val) { Value = Val; } 616 void setLocation(SourceLocation Location) { Loc = Location; } 617 618 static bool classof(const Stmt *T) { 619 return T->getStmtClass() == IntegerLiteralClass; 620 } 621 static bool classof(const IntegerLiteral *) { return true; } 622 623 // Iterators 624 virtual child_iterator child_begin(); 625 virtual child_iterator child_end(); 626}; 627 628class CharacterLiteral : public Expr { 629 unsigned Value; 630 SourceLocation Loc; 631 bool IsWide; 632public: 633 // type should be IntTy 634 CharacterLiteral(unsigned value, bool iswide, QualType type, SourceLocation l) 635 : Expr(CharacterLiteralClass, type), Value(value), Loc(l), IsWide(iswide) { 636 } 637 638 /// \brief Construct an empty character literal. 639 CharacterLiteral(EmptyShell Empty) : Expr(CharacterLiteralClass, Empty) { } 640 641 SourceLocation getLocation() const { return Loc; } 642 bool isWide() const { return IsWide; } 643 644 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 645 646 unsigned getValue() const { return Value; } 647 648 void setLocation(SourceLocation Location) { Loc = Location; } 649 void setWide(bool W) { IsWide = W; } 650 void setValue(unsigned Val) { Value = Val; } 651 652 static bool classof(const Stmt *T) { 653 return T->getStmtClass() == CharacterLiteralClass; 654 } 655 static bool classof(const CharacterLiteral *) { return true; } 656 657 // Iterators 658 virtual child_iterator child_begin(); 659 virtual child_iterator child_end(); 660}; 661 662class FloatingLiteral : public Expr { 663 llvm::APFloat Value; 664 bool IsExact : 1; 665 SourceLocation Loc; 666public: 667 FloatingLiteral(const llvm::APFloat &V, bool isexact, 668 QualType Type, SourceLocation L) 669 : Expr(FloatingLiteralClass, Type), Value(V), IsExact(isexact), Loc(L) {} 670 671 /// \brief Construct an empty floating-point literal. 672 explicit FloatingLiteral(EmptyShell Empty) 673 : Expr(FloatingLiteralClass, Empty), Value(0.0) { } 674 675 const llvm::APFloat &getValue() const { return Value; } 676 void setValue(const llvm::APFloat &Val) { Value = Val; } 677 678 bool isExact() const { return IsExact; } 679 void setExact(bool E) { IsExact = E; } 680 681 /// getValueAsApproximateDouble - This returns the value as an inaccurate 682 /// double. Note that this may cause loss of precision, but is useful for 683 /// debugging dumps, etc. 684 double getValueAsApproximateDouble() const; 685 686 SourceLocation getLocation() const { return Loc; } 687 void setLocation(SourceLocation L) { Loc = L; } 688 689 // FIXME: The logic for computing the value of a predefined expr should go 690 // into a method here that takes the inner-most code decl (a block, function 691 // or objc method) that the expr lives in. This would allow sema and codegen 692 // to be consistent for things like sizeof(__func__) etc. 693 694 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 695 696 static bool classof(const Stmt *T) { 697 return T->getStmtClass() == FloatingLiteralClass; 698 } 699 static bool classof(const FloatingLiteral *) { return true; } 700 701 // Iterators 702 virtual child_iterator child_begin(); 703 virtual child_iterator child_end(); 704}; 705 706/// ImaginaryLiteral - We support imaginary integer and floating point literals, 707/// like "1.0i". We represent these as a wrapper around FloatingLiteral and 708/// IntegerLiteral classes. Instances of this class always have a Complex type 709/// whose element type matches the subexpression. 710/// 711class ImaginaryLiteral : public Expr { 712 Stmt *Val; 713public: 714 ImaginaryLiteral(Expr *val, QualType Ty) 715 : Expr(ImaginaryLiteralClass, Ty), Val(val) {} 716 717 /// \brief Build an empty imaginary literal. 718 explicit ImaginaryLiteral(EmptyShell Empty) 719 : Expr(ImaginaryLiteralClass, Empty) { } 720 721 const Expr *getSubExpr() const { return cast<Expr>(Val); } 722 Expr *getSubExpr() { return cast<Expr>(Val); } 723 void setSubExpr(Expr *E) { Val = E; } 724 725 virtual SourceRange getSourceRange() const { return Val->getSourceRange(); } 726 static bool classof(const Stmt *T) { 727 return T->getStmtClass() == ImaginaryLiteralClass; 728 } 729 static bool classof(const ImaginaryLiteral *) { return true; } 730 731 // Iterators 732 virtual child_iterator child_begin(); 733 virtual child_iterator child_end(); 734}; 735 736/// StringLiteral - This represents a string literal expression, e.g. "foo" 737/// or L"bar" (wide strings). The actual string is returned by getStrData() 738/// is NOT null-terminated, and the length of the string is determined by 739/// calling getByteLength(). The C type for a string is always a 740/// ConstantArrayType. In C++, the char type is const qualified, in C it is 741/// not. 742/// 743/// Note that strings in C can be formed by concatenation of multiple string 744/// literal pptokens in translation phase #6. This keeps track of the locations 745/// of each of these pieces. 746/// 747/// Strings in C can also be truncated and extended by assigning into arrays, 748/// e.g. with constructs like: 749/// char X[2] = "foobar"; 750/// In this case, getByteLength() will return 6, but the string literal will 751/// have type "char[2]". 752class StringLiteral : public Expr { 753 const char *StrData; 754 unsigned ByteLength; 755 bool IsWide; 756 unsigned NumConcatenated; 757 SourceLocation TokLocs[1]; 758 759 StringLiteral(QualType Ty) : Expr(StringLiteralClass, Ty) {} 760 761protected: 762 virtual void DoDestroy(ASTContext &C); 763 764public: 765 /// This is the "fully general" constructor that allows representation of 766 /// strings formed from multiple concatenated tokens. 767 static StringLiteral *Create(ASTContext &C, const char *StrData, 768 unsigned ByteLength, bool Wide, QualType Ty, 769 const SourceLocation *Loc, unsigned NumStrs); 770 771 /// Simple constructor for string literals made from one token. 772 static StringLiteral *Create(ASTContext &C, const char *StrData, 773 unsigned ByteLength, 774 bool Wide, QualType Ty, SourceLocation Loc) { 775 return Create(C, StrData, ByteLength, Wide, Ty, &Loc, 1); 776 } 777 778 /// \brief Construct an empty string literal. 779 static StringLiteral *CreateEmpty(ASTContext &C, unsigned NumStrs); 780 781 llvm::StringRef getString() const { 782 return llvm::StringRef(StrData, ByteLength); 783 } 784 // FIXME: These are deprecated, replace with StringRef. 785 const char *getStrData() const { return StrData; } 786 unsigned getByteLength() const { return ByteLength; } 787 788 /// \brief Sets the string data to the given string data. 789 void setString(ASTContext &C, llvm::StringRef Str); 790 791 bool isWide() const { return IsWide; } 792 void setWide(bool W) { IsWide = W; } 793 794 bool containsNonAsciiOrNull() const { 795 llvm::StringRef Str = getString(); 796 for (unsigned i = 0, e = Str.size(); i != e; ++i) 797 if (!isascii(Str[i]) || !Str[i]) 798 return true; 799 return false; 800 } 801 /// getNumConcatenated - Get the number of string literal tokens that were 802 /// concatenated in translation phase #6 to form this string literal. 803 unsigned getNumConcatenated() const { return NumConcatenated; } 804 805 SourceLocation getStrTokenLoc(unsigned TokNum) const { 806 assert(TokNum < NumConcatenated && "Invalid tok number"); 807 return TokLocs[TokNum]; 808 } 809 void setStrTokenLoc(unsigned TokNum, SourceLocation L) { 810 assert(TokNum < NumConcatenated && "Invalid tok number"); 811 TokLocs[TokNum] = L; 812 } 813 814 typedef const SourceLocation *tokloc_iterator; 815 tokloc_iterator tokloc_begin() const { return TokLocs; } 816 tokloc_iterator tokloc_end() const { return TokLocs+NumConcatenated; } 817 818 virtual SourceRange getSourceRange() const { 819 return SourceRange(TokLocs[0], TokLocs[NumConcatenated-1]); 820 } 821 static bool classof(const Stmt *T) { 822 return T->getStmtClass() == StringLiteralClass; 823 } 824 static bool classof(const StringLiteral *) { return true; } 825 826 // Iterators 827 virtual child_iterator child_begin(); 828 virtual child_iterator child_end(); 829}; 830 831/// ParenExpr - This represents a parethesized expression, e.g. "(1)". This 832/// AST node is only formed if full location information is requested. 833class ParenExpr : public Expr { 834 SourceLocation L, R; 835 Stmt *Val; 836public: 837 ParenExpr(SourceLocation l, SourceLocation r, Expr *val) 838 : Expr(ParenExprClass, val->getType(), 839 val->isTypeDependent(), val->isValueDependent()), 840 L(l), R(r), Val(val) {} 841 842 /// \brief Construct an empty parenthesized expression. 843 explicit ParenExpr(EmptyShell Empty) 844 : Expr(ParenExprClass, Empty) { } 845 846 const Expr *getSubExpr() const { return cast<Expr>(Val); } 847 Expr *getSubExpr() { return cast<Expr>(Val); } 848 void setSubExpr(Expr *E) { Val = E; } 849 850 virtual SourceRange getSourceRange() const { return SourceRange(L, R); } 851 852 /// \brief Get the location of the left parentheses '('. 853 SourceLocation getLParen() const { return L; } 854 void setLParen(SourceLocation Loc) { L = Loc; } 855 856 /// \brief Get the location of the right parentheses ')'. 857 SourceLocation getRParen() const { return R; } 858 void setRParen(SourceLocation Loc) { R = Loc; } 859 860 static bool classof(const Stmt *T) { 861 return T->getStmtClass() == ParenExprClass; 862 } 863 static bool classof(const ParenExpr *) { return true; } 864 865 // Iterators 866 virtual child_iterator child_begin(); 867 virtual child_iterator child_end(); 868}; 869 870 871/// UnaryOperator - This represents the unary-expression's (except sizeof and 872/// alignof), the postinc/postdec operators from postfix-expression, and various 873/// extensions. 874/// 875/// Notes on various nodes: 876/// 877/// Real/Imag - These return the real/imag part of a complex operand. If 878/// applied to a non-complex value, the former returns its operand and the 879/// later returns zero in the type of the operand. 880/// 881/// __builtin_offsetof(type, a.b[10]) is represented as a unary operator whose 882/// subexpression is a compound literal with the various MemberExpr and 883/// ArraySubscriptExpr's applied to it. 884/// 885class UnaryOperator : public Expr { 886public: 887 // Note that additions to this should also update the StmtVisitor class. 888 enum Opcode { 889 PostInc, PostDec, // [C99 6.5.2.4] Postfix increment and decrement operators 890 PreInc, PreDec, // [C99 6.5.3.1] Prefix increment and decrement operators. 891 AddrOf, Deref, // [C99 6.5.3.2] Address and indirection operators. 892 Plus, Minus, // [C99 6.5.3.3] Unary arithmetic operators. 893 Not, LNot, // [C99 6.5.3.3] Unary arithmetic operators. 894 Real, Imag, // "__real expr"/"__imag expr" Extension. 895 Extension, // __extension__ marker. 896 OffsetOf // __builtin_offsetof 897 }; 898private: 899 Stmt *Val; 900 Opcode Opc; 901 SourceLocation Loc; 902public: 903 904 UnaryOperator(Expr *input, Opcode opc, QualType type, SourceLocation l) 905 : Expr(UnaryOperatorClass, type, 906 input->isTypeDependent() && opc != OffsetOf, 907 input->isValueDependent()), 908 Val(input), Opc(opc), Loc(l) {} 909 910 /// \brief Build an empty unary operator. 911 explicit UnaryOperator(EmptyShell Empty) 912 : Expr(UnaryOperatorClass, Empty), Opc(AddrOf) { } 913 914 Opcode getOpcode() const { return Opc; } 915 void setOpcode(Opcode O) { Opc = O; } 916 917 Expr *getSubExpr() const { return cast<Expr>(Val); } 918 void setSubExpr(Expr *E) { Val = E; } 919 920 /// getOperatorLoc - Return the location of the operator. 921 SourceLocation getOperatorLoc() const { return Loc; } 922 void setOperatorLoc(SourceLocation L) { Loc = L; } 923 924 /// isPostfix - Return true if this is a postfix operation, like x++. 925 static bool isPostfix(Opcode Op) { 926 return Op == PostInc || Op == PostDec; 927 } 928 929 /// isPostfix - Return true if this is a prefix operation, like --x. 930 static bool isPrefix(Opcode Op) { 931 return Op == PreInc || Op == PreDec; 932 } 933 934 bool isPrefix() const { return isPrefix(Opc); } 935 bool isPostfix() const { return isPostfix(Opc); } 936 bool isIncrementOp() const {return Opc==PreInc || Opc==PostInc; } 937 bool isIncrementDecrementOp() const { return Opc>=PostInc && Opc<=PreDec; } 938 bool isOffsetOfOp() const { return Opc == OffsetOf; } 939 static bool isArithmeticOp(Opcode Op) { return Op >= Plus && Op <= LNot; } 940 bool isArithmeticOp() const { return isArithmeticOp(Opc); } 941 942 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 943 /// corresponds to, e.g. "sizeof" or "[pre]++" 944 static const char *getOpcodeStr(Opcode Op); 945 946 /// \brief Retrieve the unary opcode that corresponds to the given 947 /// overloaded operator. 948 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO, bool Postfix); 949 950 /// \brief Retrieve the overloaded operator kind that corresponds to 951 /// the given unary opcode. 952 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 953 954 virtual SourceRange getSourceRange() const { 955 if (isPostfix()) 956 return SourceRange(Val->getLocStart(), Loc); 957 else 958 return SourceRange(Loc, Val->getLocEnd()); 959 } 960 virtual SourceLocation getExprLoc() const { return Loc; } 961 962 static bool classof(const Stmt *T) { 963 return T->getStmtClass() == UnaryOperatorClass; 964 } 965 static bool classof(const UnaryOperator *) { return true; } 966 967 // Iterators 968 virtual child_iterator child_begin(); 969 virtual child_iterator child_end(); 970}; 971 972/// SizeOfAlignOfExpr - [C99 6.5.3.4] - This is for sizeof/alignof, both of 973/// types and expressions. 974class SizeOfAlignOfExpr : public Expr { 975 bool isSizeof : 1; // true if sizeof, false if alignof. 976 bool isType : 1; // true if operand is a type, false if an expression 977 union { 978 void *Ty; 979 Stmt *Ex; 980 } Argument; 981 SourceLocation OpLoc, RParenLoc; 982 983protected: 984 virtual void DoDestroy(ASTContext& C); 985 986public: 987 SizeOfAlignOfExpr(bool issizeof, QualType T, 988 QualType resultType, SourceLocation op, 989 SourceLocation rp) : 990 Expr(SizeOfAlignOfExprClass, resultType, 991 false, // Never type-dependent (C++ [temp.dep.expr]p3). 992 // Value-dependent if the argument is type-dependent. 993 T->isDependentType()), 994 isSizeof(issizeof), isType(true), OpLoc(op), RParenLoc(rp) { 995 Argument.Ty = T.getAsOpaquePtr(); 996 } 997 998 SizeOfAlignOfExpr(bool issizeof, Expr *E, 999 QualType resultType, SourceLocation op, 1000 SourceLocation rp) : 1001 Expr(SizeOfAlignOfExprClass, resultType, 1002 false, // Never type-dependent (C++ [temp.dep.expr]p3). 1003 // Value-dependent if the argument is type-dependent. 1004 E->isTypeDependent()), 1005 isSizeof(issizeof), isType(false), OpLoc(op), RParenLoc(rp) { 1006 Argument.Ex = E; 1007 } 1008 1009 /// \brief Construct an empty sizeof/alignof expression. 1010 explicit SizeOfAlignOfExpr(EmptyShell Empty) 1011 : Expr(SizeOfAlignOfExprClass, Empty) { } 1012 1013 bool isSizeOf() const { return isSizeof; } 1014 void setSizeof(bool S) { isSizeof = S; } 1015 1016 bool isArgumentType() const { return isType; } 1017 QualType getArgumentType() const { 1018 assert(isArgumentType() && "calling getArgumentType() when arg is expr"); 1019 return QualType::getFromOpaquePtr(Argument.Ty); 1020 } 1021 Expr *getArgumentExpr() { 1022 assert(!isArgumentType() && "calling getArgumentExpr() when arg is type"); 1023 return static_cast<Expr*>(Argument.Ex); 1024 } 1025 const Expr *getArgumentExpr() const { 1026 return const_cast<SizeOfAlignOfExpr*>(this)->getArgumentExpr(); 1027 } 1028 1029 void setArgument(Expr *E) { Argument.Ex = E; isType = false; } 1030 void setArgument(QualType T) { 1031 Argument.Ty = T.getAsOpaquePtr(); 1032 isType = true; 1033 } 1034 1035 /// Gets the argument type, or the type of the argument expression, whichever 1036 /// is appropriate. 1037 QualType getTypeOfArgument() const { 1038 return isArgumentType() ? getArgumentType() : getArgumentExpr()->getType(); 1039 } 1040 1041 SourceLocation getOperatorLoc() const { return OpLoc; } 1042 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1043 1044 SourceLocation getRParenLoc() const { return RParenLoc; } 1045 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1046 1047 virtual SourceRange getSourceRange() const { 1048 return SourceRange(OpLoc, RParenLoc); 1049 } 1050 1051 static bool classof(const Stmt *T) { 1052 return T->getStmtClass() == SizeOfAlignOfExprClass; 1053 } 1054 static bool classof(const SizeOfAlignOfExpr *) { return true; } 1055 1056 // Iterators 1057 virtual child_iterator child_begin(); 1058 virtual child_iterator child_end(); 1059}; 1060 1061//===----------------------------------------------------------------------===// 1062// Postfix Operators. 1063//===----------------------------------------------------------------------===// 1064 1065/// ArraySubscriptExpr - [C99 6.5.2.1] Array Subscripting. 1066class ArraySubscriptExpr : public Expr { 1067 enum { LHS, RHS, END_EXPR=2 }; 1068 Stmt* SubExprs[END_EXPR]; 1069 SourceLocation RBracketLoc; 1070public: 1071 ArraySubscriptExpr(Expr *lhs, Expr *rhs, QualType t, 1072 SourceLocation rbracketloc) 1073 : Expr(ArraySubscriptExprClass, t, 1074 lhs->isTypeDependent() || rhs->isTypeDependent(), 1075 lhs->isValueDependent() || rhs->isValueDependent()), 1076 RBracketLoc(rbracketloc) { 1077 SubExprs[LHS] = lhs; 1078 SubExprs[RHS] = rhs; 1079 } 1080 1081 /// \brief Create an empty array subscript expression. 1082 explicit ArraySubscriptExpr(EmptyShell Shell) 1083 : Expr(ArraySubscriptExprClass, Shell) { } 1084 1085 /// An array access can be written A[4] or 4[A] (both are equivalent). 1086 /// - getBase() and getIdx() always present the normalized view: A[4]. 1087 /// In this case getBase() returns "A" and getIdx() returns "4". 1088 /// - getLHS() and getRHS() present the syntactic view. e.g. for 1089 /// 4[A] getLHS() returns "4". 1090 /// Note: Because vector element access is also written A[4] we must 1091 /// predicate the format conversion in getBase and getIdx only on the 1092 /// the type of the RHS, as it is possible for the LHS to be a vector of 1093 /// integer type 1094 Expr *getLHS() { return cast<Expr>(SubExprs[LHS]); } 1095 const Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1096 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1097 1098 Expr *getRHS() { return cast<Expr>(SubExprs[RHS]); } 1099 const Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1100 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1101 1102 Expr *getBase() { 1103 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1104 } 1105 1106 const Expr *getBase() const { 1107 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getLHS():getRHS()); 1108 } 1109 1110 Expr *getIdx() { 1111 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1112 } 1113 1114 const Expr *getIdx() const { 1115 return cast<Expr>(getRHS()->getType()->isIntegerType() ? getRHS():getLHS()); 1116 } 1117 1118 virtual SourceRange getSourceRange() const { 1119 return SourceRange(getLHS()->getLocStart(), RBracketLoc); 1120 } 1121 1122 SourceLocation getRBracketLoc() const { return RBracketLoc; } 1123 void setRBracketLoc(SourceLocation L) { RBracketLoc = L; } 1124 1125 virtual SourceLocation getExprLoc() const { return getBase()->getExprLoc(); } 1126 1127 static bool classof(const Stmt *T) { 1128 return T->getStmtClass() == ArraySubscriptExprClass; 1129 } 1130 static bool classof(const ArraySubscriptExpr *) { return true; } 1131 1132 // Iterators 1133 virtual child_iterator child_begin(); 1134 virtual child_iterator child_end(); 1135}; 1136 1137 1138/// CallExpr - Represents a function call (C99 6.5.2.2, C++ [expr.call]). 1139/// CallExpr itself represents a normal function call, e.g., "f(x, 2)", 1140/// while its subclasses may represent alternative syntax that (semantically) 1141/// results in a function call. For example, CXXOperatorCallExpr is 1142/// a subclass for overloaded operator calls that use operator syntax, e.g., 1143/// "str1 + str2" to resolve to a function call. 1144class CallExpr : public Expr { 1145 enum { FN=0, ARGS_START=1 }; 1146 Stmt **SubExprs; 1147 unsigned NumArgs; 1148 SourceLocation RParenLoc; 1149 1150protected: 1151 // This version of the constructor is for derived classes. 1152 CallExpr(ASTContext& C, StmtClass SC, Expr *fn, Expr **args, unsigned numargs, 1153 QualType t, SourceLocation rparenloc); 1154 1155 virtual void DoDestroy(ASTContext& C); 1156 1157public: 1158 CallExpr(ASTContext& C, Expr *fn, Expr **args, unsigned numargs, QualType t, 1159 SourceLocation rparenloc); 1160 1161 /// \brief Build an empty call expression. 1162 CallExpr(ASTContext &C, StmtClass SC, EmptyShell Empty); 1163 1164 ~CallExpr() {} 1165 1166 const Expr *getCallee() const { return cast<Expr>(SubExprs[FN]); } 1167 Expr *getCallee() { return cast<Expr>(SubExprs[FN]); } 1168 void setCallee(Expr *F) { SubExprs[FN] = F; } 1169 1170 /// \brief If the callee is a FunctionDecl, return it. Otherwise return 0. 1171 FunctionDecl *getDirectCallee(); 1172 const FunctionDecl *getDirectCallee() const { 1173 return const_cast<CallExpr*>(this)->getDirectCallee(); 1174 } 1175 1176 /// getNumArgs - Return the number of actual arguments to this call. 1177 /// 1178 unsigned getNumArgs() const { return NumArgs; } 1179 1180 /// getArg - Return the specified argument. 1181 Expr *getArg(unsigned Arg) { 1182 assert(Arg < NumArgs && "Arg access out of range!"); 1183 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1184 } 1185 const Expr *getArg(unsigned Arg) const { 1186 assert(Arg < NumArgs && "Arg access out of range!"); 1187 return cast<Expr>(SubExprs[Arg+ARGS_START]); 1188 } 1189 1190 /// setArg - Set the specified argument. 1191 void setArg(unsigned Arg, Expr *ArgExpr) { 1192 assert(Arg < NumArgs && "Arg access out of range!"); 1193 SubExprs[Arg+ARGS_START] = ArgExpr; 1194 } 1195 1196 /// setNumArgs - This changes the number of arguments present in this call. 1197 /// Any orphaned expressions are deleted by this, and any new operands are set 1198 /// to null. 1199 void setNumArgs(ASTContext& C, unsigned NumArgs); 1200 1201 typedef ExprIterator arg_iterator; 1202 typedef ConstExprIterator const_arg_iterator; 1203 1204 arg_iterator arg_begin() { return SubExprs+ARGS_START; } 1205 arg_iterator arg_end() { return SubExprs+ARGS_START+getNumArgs(); } 1206 const_arg_iterator arg_begin() const { return SubExprs+ARGS_START; } 1207 const_arg_iterator arg_end() const { return SubExprs+ARGS_START+getNumArgs();} 1208 1209 /// getNumCommas - Return the number of commas that must have been present in 1210 /// this function call. 1211 unsigned getNumCommas() const { return NumArgs ? NumArgs - 1 : 0; } 1212 1213 /// isBuiltinCall - If this is a call to a builtin, return the builtin ID. If 1214 /// not, return 0. 1215 unsigned isBuiltinCall(ASTContext &Context) const; 1216 1217 /// getCallReturnType - Get the return type of the call expr. This is not 1218 /// always the type of the expr itself, if the return type is a reference 1219 /// type. 1220 QualType getCallReturnType() const; 1221 1222 SourceLocation getRParenLoc() const { return RParenLoc; } 1223 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 1224 1225 virtual SourceRange getSourceRange() const { 1226 return SourceRange(getCallee()->getLocStart(), RParenLoc); 1227 } 1228 1229 static bool classof(const Stmt *T) { 1230 return T->getStmtClass() == CallExprClass || 1231 T->getStmtClass() == CXXOperatorCallExprClass || 1232 T->getStmtClass() == CXXMemberCallExprClass; 1233 } 1234 static bool classof(const CallExpr *) { return true; } 1235 static bool classof(const CXXOperatorCallExpr *) { return true; } 1236 static bool classof(const CXXMemberCallExpr *) { return true; } 1237 1238 // Iterators 1239 virtual child_iterator child_begin(); 1240 virtual child_iterator child_end(); 1241}; 1242 1243/// MemberExpr - [C99 6.5.2.3] Structure and Union Members. X->F and X.F. 1244/// 1245class MemberExpr : public Expr { 1246 /// Base - the expression for the base pointer or structure references. In 1247 /// X.F, this is "X". 1248 Stmt *Base; 1249 1250 /// MemberDecl - This is the decl being referenced by the field/member name. 1251 /// In X.F, this is the decl referenced by F. 1252 NamedDecl *MemberDecl; 1253 1254 /// MemberLoc - This is the location of the member name. 1255 SourceLocation MemberLoc; 1256 1257 /// IsArrow - True if this is "X->F", false if this is "X.F". 1258 bool IsArrow : 1; 1259 1260 /// \brief True if this member expression used a nested-name-specifier to 1261 /// refer to the member, e.g., "x->Base::f". When true, a NameQualifier 1262 /// structure is allocated immediately after the MemberExpr. 1263 bool HasQualifier : 1; 1264 1265 /// \brief True if this member expression specified a template argument list 1266 /// explicitly, e.g., x->f<int>. When true, an ExplicitTemplateArgumentList 1267 /// structure (and its TemplateArguments) are allocated immediately after 1268 /// the MemberExpr or, if the member expression also has a qualifier, after 1269 /// the NameQualifier structure. 1270 bool HasExplicitTemplateArgumentList : 1; 1271 1272 /// \brief Retrieve the qualifier that preceded the member name, if any. 1273 NameQualifier *getMemberQualifier() { 1274 if (!HasQualifier) 1275 return 0; 1276 1277 return reinterpret_cast<NameQualifier *> (this + 1); 1278 } 1279 1280 /// \brief Retrieve the qualifier that preceded the member name, if any. 1281 const NameQualifier *getMemberQualifier() const { 1282 return const_cast<MemberExpr *>(this)->getMemberQualifier(); 1283 } 1284 1285 /// \brief Retrieve the explicit template argument list that followed the 1286 /// member template name, if any. 1287 ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() { 1288 if (!HasExplicitTemplateArgumentList) 1289 return 0; 1290 1291 if (!HasQualifier) 1292 return reinterpret_cast<ExplicitTemplateArgumentList *>(this + 1); 1293 1294 return reinterpret_cast<ExplicitTemplateArgumentList *>( 1295 getMemberQualifier() + 1); 1296 } 1297 1298 /// \brief Retrieve the explicit template argument list that followed the 1299 /// member template name, if any. 1300 const ExplicitTemplateArgumentList *getExplicitTemplateArgumentList() const { 1301 return const_cast<MemberExpr *>(this)->getExplicitTemplateArgumentList(); 1302 } 1303 1304 MemberExpr(Expr *base, bool isarrow, NestedNameSpecifier *qual, 1305 SourceRange qualrange, NamedDecl *memberdecl, SourceLocation l, 1306 bool has_explicit, SourceLocation langle, 1307 const TemplateArgument *targs, unsigned numtargs, 1308 SourceLocation rangle, QualType ty); 1309 1310public: 1311 MemberExpr(Expr *base, bool isarrow, NamedDecl *memberdecl, SourceLocation l, 1312 QualType ty) 1313 : Expr(MemberExprClass, ty, 1314 base->isTypeDependent(), base->isValueDependent()), 1315 Base(base), MemberDecl(memberdecl), MemberLoc(l), IsArrow(isarrow), 1316 HasQualifier(false), HasExplicitTemplateArgumentList(false) {} 1317 1318 /// \brief Build an empty member reference expression. 1319 explicit MemberExpr(EmptyShell Empty) 1320 : Expr(MemberExprClass, Empty), HasQualifier(false), 1321 HasExplicitTemplateArgumentList(false) { } 1322 1323 static MemberExpr *Create(ASTContext &C, Expr *base, bool isarrow, 1324 NestedNameSpecifier *qual, SourceRange qualrange, 1325 NamedDecl *memberdecl, 1326 SourceLocation l, 1327 bool has_explicit, 1328 SourceLocation langle, 1329 const TemplateArgument *targs, 1330 unsigned numtargs, 1331 SourceLocation rangle, 1332 QualType ty); 1333 1334 void setBase(Expr *E) { Base = E; } 1335 Expr *getBase() const { return cast<Expr>(Base); } 1336 1337 /// \brief Retrieve the member declaration to which this expression refers. 1338 /// 1339 /// The returned declaration will either be a FieldDecl or (in C++) 1340 /// a CXXMethodDecl. 1341 NamedDecl *getMemberDecl() const { return MemberDecl; } 1342 void setMemberDecl(NamedDecl *D) { MemberDecl = D; } 1343 1344 /// \brief Determines whether this member expression actually had 1345 /// a C++ nested-name-specifier prior to the name of the member, e.g., 1346 /// x->Base::foo. 1347 bool hasQualifier() const { return HasQualifier; } 1348 1349 /// \brief If the member name was qualified, retrieves the source range of 1350 /// the nested-name-specifier that precedes the member name. Otherwise, 1351 /// returns an empty source range. 1352 SourceRange getQualifierRange() const { 1353 if (!HasQualifier) 1354 return SourceRange(); 1355 1356 return getMemberQualifier()->Range; 1357 } 1358 1359 /// \brief If the member name was qualified, retrieves the 1360 /// nested-name-specifier that precedes the member name. Otherwise, returns 1361 /// NULL. 1362 NestedNameSpecifier *getQualifier() const { 1363 if (!HasQualifier) 1364 return 0; 1365 1366 return getMemberQualifier()->NNS; 1367 } 1368 1369 /// \brief Determines whether this member expression actually had a C++ 1370 /// template argument list explicitly specified, e.g., x.f<int>. 1371 bool hasExplicitTemplateArgumentList() { 1372 return HasExplicitTemplateArgumentList; 1373 } 1374 1375 /// \brief Retrieve the location of the left angle bracket following the 1376 /// member name ('<'), if any. 1377 SourceLocation getLAngleLoc() const { 1378 if (!HasExplicitTemplateArgumentList) 1379 return SourceLocation(); 1380 1381 return getExplicitTemplateArgumentList()->LAngleLoc; 1382 } 1383 1384 /// \brief Retrieve the template arguments provided as part of this 1385 /// template-id. 1386 const TemplateArgument *getTemplateArgs() const { 1387 if (!HasExplicitTemplateArgumentList) 1388 return 0; 1389 1390 return getExplicitTemplateArgumentList()->getTemplateArgs(); 1391 } 1392 1393 /// \brief Retrieve the number of template arguments provided as part of this 1394 /// template-id. 1395 unsigned getNumTemplateArgs() const { 1396 if (!HasExplicitTemplateArgumentList) 1397 return 0; 1398 1399 return getExplicitTemplateArgumentList()->NumTemplateArgs; 1400 } 1401 1402 /// \brief Retrieve the location of the right angle bracket following the 1403 /// template arguments ('>'). 1404 SourceLocation getRAngleLoc() const { 1405 if (!HasExplicitTemplateArgumentList) 1406 return SourceLocation(); 1407 1408 return getExplicitTemplateArgumentList()->RAngleLoc; 1409 } 1410 1411 bool isArrow() const { return IsArrow; } 1412 void setArrow(bool A) { IsArrow = A; } 1413 1414 /// getMemberLoc - Return the location of the "member", in X->F, it is the 1415 /// location of 'F'. 1416 SourceLocation getMemberLoc() const { return MemberLoc; } 1417 void setMemberLoc(SourceLocation L) { MemberLoc = L; } 1418 1419 virtual SourceRange getSourceRange() const { 1420 // If we have an implicit base (like a C++ implicit this), 1421 // make sure not to return its location 1422 SourceLocation EndLoc = MemberLoc; 1423 if (HasExplicitTemplateArgumentList) 1424 EndLoc = getRAngleLoc(); 1425 1426 SourceLocation BaseLoc = getBase()->getLocStart(); 1427 if (BaseLoc.isInvalid()) 1428 return SourceRange(MemberLoc, EndLoc); 1429 return SourceRange(BaseLoc, EndLoc); 1430 } 1431 1432 virtual SourceLocation getExprLoc() const { return MemberLoc; } 1433 1434 static bool classof(const Stmt *T) { 1435 return T->getStmtClass() == MemberExprClass; 1436 } 1437 static bool classof(const MemberExpr *) { return true; } 1438 1439 // Iterators 1440 virtual child_iterator child_begin(); 1441 virtual child_iterator child_end(); 1442}; 1443 1444/// CompoundLiteralExpr - [C99 6.5.2.5] 1445/// 1446class CompoundLiteralExpr : public Expr { 1447 /// LParenLoc - If non-null, this is the location of the left paren in a 1448 /// compound literal like "(int){4}". This can be null if this is a 1449 /// synthesized compound expression. 1450 SourceLocation LParenLoc; 1451 Stmt *Init; 1452 bool FileScope; 1453public: 1454 CompoundLiteralExpr(SourceLocation lparenloc, QualType ty, Expr *init, 1455 bool fileScope) 1456 : Expr(CompoundLiteralExprClass, ty), LParenLoc(lparenloc), Init(init), 1457 FileScope(fileScope) {} 1458 1459 /// \brief Construct an empty compound literal. 1460 explicit CompoundLiteralExpr(EmptyShell Empty) 1461 : Expr(CompoundLiteralExprClass, Empty) { } 1462 1463 const Expr *getInitializer() const { return cast<Expr>(Init); } 1464 Expr *getInitializer() { return cast<Expr>(Init); } 1465 void setInitializer(Expr *E) { Init = E; } 1466 1467 bool isFileScope() const { return FileScope; } 1468 void setFileScope(bool FS) { FileScope = FS; } 1469 1470 SourceLocation getLParenLoc() const { return LParenLoc; } 1471 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 1472 1473 virtual SourceRange getSourceRange() const { 1474 // FIXME: Init should never be null. 1475 if (!Init) 1476 return SourceRange(); 1477 if (LParenLoc.isInvalid()) 1478 return Init->getSourceRange(); 1479 return SourceRange(LParenLoc, Init->getLocEnd()); 1480 } 1481 1482 static bool classof(const Stmt *T) { 1483 return T->getStmtClass() == CompoundLiteralExprClass; 1484 } 1485 static bool classof(const CompoundLiteralExpr *) { return true; } 1486 1487 // Iterators 1488 virtual child_iterator child_begin(); 1489 virtual child_iterator child_end(); 1490}; 1491 1492/// CastExpr - Base class for type casts, including both implicit 1493/// casts (ImplicitCastExpr) and explicit casts that have some 1494/// representation in the source code (ExplicitCastExpr's derived 1495/// classes). 1496class CastExpr : public Expr { 1497public: 1498 /// CastKind - the kind of cast this represents. 1499 enum CastKind { 1500 /// CK_Unknown - Unknown cast kind. 1501 /// FIXME: The goal is to get rid of this and make all casts have a 1502 /// kind so that the AST client doesn't have to try to figure out what's 1503 /// going on. 1504 CK_Unknown, 1505 1506 /// CK_BitCast - Used for reinterpret_cast. 1507 CK_BitCast, 1508 1509 /// CK_NoOp - Used for const_cast. 1510 CK_NoOp, 1511 1512 /// CK_DerivedToBase - Derived to base class casts. 1513 CK_DerivedToBase, 1514 1515 /// CK_Dynamic - Dynamic cast. 1516 CK_Dynamic, 1517 1518 /// CK_ToUnion - Cast to union (GCC extension). 1519 CK_ToUnion, 1520 1521 /// CK_ArrayToPointerDecay - Array to pointer decay. 1522 CK_ArrayToPointerDecay, 1523 1524 // CK_FunctionToPointerDecay - Function to pointer decay. 1525 CK_FunctionToPointerDecay, 1526 1527 /// CK_NullToMemberPointer - Null pointer to member pointer. 1528 CK_NullToMemberPointer, 1529 1530 /// CK_BaseToDerivedMemberPointer - Member pointer in base class to 1531 /// member pointer in derived class. 1532 CK_BaseToDerivedMemberPointer, 1533 1534 /// CK_UserDefinedConversion - Conversion using a user defined type 1535 /// conversion function. 1536 CK_UserDefinedConversion, 1537 1538 /// CK_ConstructorConversion - Conversion by constructor 1539 CK_ConstructorConversion, 1540 1541 /// CK_IntegralToPointer - Integral to pointer 1542 CK_IntegralToPointer, 1543 1544 /// CK_PointerToIntegral - Pointer to integral 1545 CK_PointerToIntegral, 1546 1547 /// CK_ToVoid - Cast to void. 1548 CK_ToVoid, 1549 1550 /// CK_VectorSplat - Casting from an integer/floating type to an extended 1551 /// vector type with the same element type as the src type. Splats the 1552 /// src expression into the destination expression. 1553 CK_VectorSplat, 1554 1555 /// CK_IntegralCast - Casting between integral types of different size. 1556 CK_IntegralCast, 1557 1558 /// CK_IntegralToFloating - Integral to floating point. 1559 CK_IntegralToFloating, 1560 1561 /// CK_FloatingToIntegral - Floating point to integral. 1562 CK_FloatingToIntegral, 1563 1564 /// CK_FloatingCast - Casting between floating types of different size. 1565 CK_FloatingCast 1566 }; 1567 1568private: 1569 CastKind Kind; 1570 Stmt *Op; 1571protected: 1572 CastExpr(StmtClass SC, QualType ty, const CastKind kind, Expr *op) : 1573 Expr(SC, ty, 1574 // Cast expressions are type-dependent if the type is 1575 // dependent (C++ [temp.dep.expr]p3). 1576 ty->isDependentType(), 1577 // Cast expressions are value-dependent if the type is 1578 // dependent or if the subexpression is value-dependent. 1579 ty->isDependentType() || (op && op->isValueDependent())), 1580 Kind(kind), Op(op) {} 1581 1582 /// \brief Construct an empty cast. 1583 CastExpr(StmtClass SC, EmptyShell Empty) 1584 : Expr(SC, Empty) { } 1585 1586public: 1587 CastKind getCastKind() const { return Kind; } 1588 void setCastKind(CastKind K) { Kind = K; } 1589 const char *getCastKindName() const; 1590 1591 Expr *getSubExpr() { return cast<Expr>(Op); } 1592 const Expr *getSubExpr() const { return cast<Expr>(Op); } 1593 void setSubExpr(Expr *E) { Op = E; } 1594 1595 static bool classof(const Stmt *T) { 1596 StmtClass SC = T->getStmtClass(); 1597 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1598 return true; 1599 1600 if (SC >= ImplicitCastExprClass && SC <= CStyleCastExprClass) 1601 return true; 1602 1603 return false; 1604 } 1605 static bool classof(const CastExpr *) { return true; } 1606 1607 // Iterators 1608 virtual child_iterator child_begin(); 1609 virtual child_iterator child_end(); 1610}; 1611 1612/// ImplicitCastExpr - Allows us to explicitly represent implicit type 1613/// conversions, which have no direct representation in the original 1614/// source code. For example: converting T[]->T*, void f()->void 1615/// (*f)(), float->double, short->int, etc. 1616/// 1617/// In C, implicit casts always produce rvalues. However, in C++, an 1618/// implicit cast whose result is being bound to a reference will be 1619/// an lvalue. For example: 1620/// 1621/// @code 1622/// class Base { }; 1623/// class Derived : public Base { }; 1624/// void f(Derived d) { 1625/// Base& b = d; // initializer is an ImplicitCastExpr to an lvalue of type Base 1626/// } 1627/// @endcode 1628class ImplicitCastExpr : public CastExpr { 1629 /// LvalueCast - Whether this cast produces an lvalue. 1630 bool LvalueCast; 1631 1632public: 1633 ImplicitCastExpr(QualType ty, CastKind kind, Expr *op, bool Lvalue) : 1634 CastExpr(ImplicitCastExprClass, ty, kind, op), LvalueCast(Lvalue) { } 1635 1636 /// \brief Construct an empty implicit cast. 1637 explicit ImplicitCastExpr(EmptyShell Shell) 1638 : CastExpr(ImplicitCastExprClass, Shell) { } 1639 1640 1641 virtual SourceRange getSourceRange() const { 1642 return getSubExpr()->getSourceRange(); 1643 } 1644 1645 /// isLvalueCast - Whether this cast produces an lvalue. 1646 bool isLvalueCast() const { return LvalueCast; } 1647 1648 /// setLvalueCast - Set whether this cast produces an lvalue. 1649 void setLvalueCast(bool Lvalue) { LvalueCast = Lvalue; } 1650 1651 static bool classof(const Stmt *T) { 1652 return T->getStmtClass() == ImplicitCastExprClass; 1653 } 1654 static bool classof(const ImplicitCastExpr *) { return true; } 1655}; 1656 1657/// ExplicitCastExpr - An explicit cast written in the source 1658/// code. 1659/// 1660/// This class is effectively an abstract class, because it provides 1661/// the basic representation of an explicitly-written cast without 1662/// specifying which kind of cast (C cast, functional cast, static 1663/// cast, etc.) was written; specific derived classes represent the 1664/// particular style of cast and its location information. 1665/// 1666/// Unlike implicit casts, explicit cast nodes have two different 1667/// types: the type that was written into the source code, and the 1668/// actual type of the expression as determined by semantic 1669/// analysis. These types may differ slightly. For example, in C++ one 1670/// can cast to a reference type, which indicates that the resulting 1671/// expression will be an lvalue. The reference type, however, will 1672/// not be used as the type of the expression. 1673class ExplicitCastExpr : public CastExpr { 1674 /// TypeAsWritten - The type that this expression is casting to, as 1675 /// written in the source code. 1676 QualType TypeAsWritten; 1677 1678protected: 1679 ExplicitCastExpr(StmtClass SC, QualType exprTy, CastKind kind, 1680 Expr *op, QualType writtenTy) 1681 : CastExpr(SC, exprTy, kind, op), TypeAsWritten(writtenTy) {} 1682 1683 /// \brief Construct an empty explicit cast. 1684 ExplicitCastExpr(StmtClass SC, EmptyShell Shell) 1685 : CastExpr(SC, Shell) { } 1686 1687public: 1688 /// getTypeAsWritten - Returns the type that this expression is 1689 /// casting to, as written in the source code. 1690 QualType getTypeAsWritten() const { return TypeAsWritten; } 1691 void setTypeAsWritten(QualType T) { TypeAsWritten = T; } 1692 1693 static bool classof(const Stmt *T) { 1694 StmtClass SC = T->getStmtClass(); 1695 if (SC >= ExplicitCastExprClass && SC <= CStyleCastExprClass) 1696 return true; 1697 if (SC >= CXXNamedCastExprClass && SC <= CXXFunctionalCastExprClass) 1698 return true; 1699 1700 return false; 1701 } 1702 static bool classof(const ExplicitCastExpr *) { return true; } 1703}; 1704 1705/// CStyleCastExpr - An explicit cast in C (C99 6.5.4) or a C-style 1706/// cast in C++ (C++ [expr.cast]), which uses the syntax 1707/// (Type)expr. For example: @c (int)f. 1708class CStyleCastExpr : public ExplicitCastExpr { 1709 SourceLocation LPLoc; // the location of the left paren 1710 SourceLocation RPLoc; // the location of the right paren 1711public: 1712 CStyleCastExpr(QualType exprTy, CastKind kind, Expr *op, QualType writtenTy, 1713 SourceLocation l, SourceLocation r) : 1714 ExplicitCastExpr(CStyleCastExprClass, exprTy, kind, op, writtenTy), 1715 LPLoc(l), RPLoc(r) {} 1716 1717 /// \brief Construct an empty C-style explicit cast. 1718 explicit CStyleCastExpr(EmptyShell Shell) 1719 : ExplicitCastExpr(CStyleCastExprClass, Shell) { } 1720 1721 SourceLocation getLParenLoc() const { return LPLoc; } 1722 void setLParenLoc(SourceLocation L) { LPLoc = L; } 1723 1724 SourceLocation getRParenLoc() const { return RPLoc; } 1725 void setRParenLoc(SourceLocation L) { RPLoc = L; } 1726 1727 virtual SourceRange getSourceRange() const { 1728 return SourceRange(LPLoc, getSubExpr()->getSourceRange().getEnd()); 1729 } 1730 static bool classof(const Stmt *T) { 1731 return T->getStmtClass() == CStyleCastExprClass; 1732 } 1733 static bool classof(const CStyleCastExpr *) { return true; } 1734}; 1735 1736/// \brief A builtin binary operation expression such as "x + y" or "x <= y". 1737/// 1738/// This expression node kind describes a builtin binary operation, 1739/// such as "x + y" for integer values "x" and "y". The operands will 1740/// already have been converted to appropriate types (e.g., by 1741/// performing promotions or conversions). 1742/// 1743/// In C++, where operators may be overloaded, a different kind of 1744/// expression node (CXXOperatorCallExpr) is used to express the 1745/// invocation of an overloaded operator with operator syntax. Within 1746/// a C++ template, whether BinaryOperator or CXXOperatorCallExpr is 1747/// used to store an expression "x + y" depends on the subexpressions 1748/// for x and y. If neither x or y is type-dependent, and the "+" 1749/// operator resolves to a built-in operation, BinaryOperator will be 1750/// used to express the computation (x and y may still be 1751/// value-dependent). If either x or y is type-dependent, or if the 1752/// "+" resolves to an overloaded operator, CXXOperatorCallExpr will 1753/// be used to express the computation. 1754class BinaryOperator : public Expr { 1755public: 1756 enum Opcode { 1757 // Operators listed in order of precedence. 1758 // Note that additions to this should also update the StmtVisitor class. 1759 PtrMemD, PtrMemI, // [C++ 5.5] Pointer-to-member operators. 1760 Mul, Div, Rem, // [C99 6.5.5] Multiplicative operators. 1761 Add, Sub, // [C99 6.5.6] Additive operators. 1762 Shl, Shr, // [C99 6.5.7] Bitwise shift operators. 1763 LT, GT, LE, GE, // [C99 6.5.8] Relational operators. 1764 EQ, NE, // [C99 6.5.9] Equality operators. 1765 And, // [C99 6.5.10] Bitwise AND operator. 1766 Xor, // [C99 6.5.11] Bitwise XOR operator. 1767 Or, // [C99 6.5.12] Bitwise OR operator. 1768 LAnd, // [C99 6.5.13] Logical AND operator. 1769 LOr, // [C99 6.5.14] Logical OR operator. 1770 Assign, MulAssign,// [C99 6.5.16] Assignment operators. 1771 DivAssign, RemAssign, 1772 AddAssign, SubAssign, 1773 ShlAssign, ShrAssign, 1774 AndAssign, XorAssign, 1775 OrAssign, 1776 Comma // [C99 6.5.17] Comma operator. 1777 }; 1778private: 1779 enum { LHS, RHS, END_EXPR }; 1780 Stmt* SubExprs[END_EXPR]; 1781 Opcode Opc; 1782 SourceLocation OpLoc; 1783public: 1784 1785 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1786 SourceLocation opLoc) 1787 : Expr(BinaryOperatorClass, ResTy, 1788 lhs->isTypeDependent() || rhs->isTypeDependent(), 1789 lhs->isValueDependent() || rhs->isValueDependent()), 1790 Opc(opc), OpLoc(opLoc) { 1791 SubExprs[LHS] = lhs; 1792 SubExprs[RHS] = rhs; 1793 assert(!isCompoundAssignmentOp() && 1794 "Use ArithAssignBinaryOperator for compound assignments"); 1795 } 1796 1797 /// \brief Construct an empty binary operator. 1798 explicit BinaryOperator(EmptyShell Empty) 1799 : Expr(BinaryOperatorClass, Empty), Opc(Comma) { } 1800 1801 SourceLocation getOperatorLoc() const { return OpLoc; } 1802 void setOperatorLoc(SourceLocation L) { OpLoc = L; } 1803 1804 Opcode getOpcode() const { return Opc; } 1805 void setOpcode(Opcode O) { Opc = O; } 1806 1807 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 1808 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1809 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1810 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1811 1812 virtual SourceRange getSourceRange() const { 1813 return SourceRange(getLHS()->getLocStart(), getRHS()->getLocEnd()); 1814 } 1815 1816 /// getOpcodeStr - Turn an Opcode enum value into the punctuation char it 1817 /// corresponds to, e.g. "<<=". 1818 static const char *getOpcodeStr(Opcode Op); 1819 1820 /// \brief Retrieve the binary opcode that corresponds to the given 1821 /// overloaded operator. 1822 static Opcode getOverloadedOpcode(OverloadedOperatorKind OO); 1823 1824 /// \brief Retrieve the overloaded operator kind that corresponds to 1825 /// the given binary opcode. 1826 static OverloadedOperatorKind getOverloadedOperator(Opcode Opc); 1827 1828 /// predicates to categorize the respective opcodes. 1829 bool isMultiplicativeOp() const { return Opc >= Mul && Opc <= Rem; } 1830 bool isAdditiveOp() const { return Opc == Add || Opc == Sub; } 1831 static bool isShiftOp(Opcode Opc) { return Opc == Shl || Opc == Shr; } 1832 bool isShiftOp() const { return isShiftOp(Opc); } 1833 1834 static bool isBitwiseOp(Opcode Opc) { return Opc >= And && Opc <= Or; } 1835 bool isBitwiseOp() const { return isBitwiseOp(Opc); } 1836 1837 static bool isRelationalOp(Opcode Opc) { return Opc >= LT && Opc <= GE; } 1838 bool isRelationalOp() const { return isRelationalOp(Opc); } 1839 1840 static bool isEqualityOp(Opcode Opc) { return Opc == EQ || Opc == NE; } 1841 bool isEqualityOp() const { return isEqualityOp(Opc); } 1842 1843 static bool isComparisonOp(Opcode Opc) { return Opc >= LT && Opc <= NE; } 1844 bool isComparisonOp() const { return isComparisonOp(Opc); } 1845 1846 static bool isLogicalOp(Opcode Opc) { return Opc == LAnd || Opc == LOr; } 1847 bool isLogicalOp() const { return isLogicalOp(Opc); } 1848 1849 bool isAssignmentOp() const { return Opc >= Assign && Opc <= OrAssign; } 1850 bool isCompoundAssignmentOp() const { return Opc > Assign && Opc <= OrAssign;} 1851 bool isShiftAssignOp() const { return Opc == ShlAssign || Opc == ShrAssign; } 1852 1853 static bool classof(const Stmt *S) { 1854 return S->getStmtClass() == BinaryOperatorClass || 1855 S->getStmtClass() == CompoundAssignOperatorClass; 1856 } 1857 static bool classof(const BinaryOperator *) { return true; } 1858 1859 // Iterators 1860 virtual child_iterator child_begin(); 1861 virtual child_iterator child_end(); 1862 1863protected: 1864 BinaryOperator(Expr *lhs, Expr *rhs, Opcode opc, QualType ResTy, 1865 SourceLocation oploc, bool dead) 1866 : Expr(CompoundAssignOperatorClass, ResTy), Opc(opc), OpLoc(oploc) { 1867 SubExprs[LHS] = lhs; 1868 SubExprs[RHS] = rhs; 1869 } 1870 1871 BinaryOperator(StmtClass SC, EmptyShell Empty) 1872 : Expr(SC, Empty), Opc(MulAssign) { } 1873}; 1874 1875/// CompoundAssignOperator - For compound assignments (e.g. +=), we keep 1876/// track of the type the operation is performed in. Due to the semantics of 1877/// these operators, the operands are promoted, the aritmetic performed, an 1878/// implicit conversion back to the result type done, then the assignment takes 1879/// place. This captures the intermediate type which the computation is done 1880/// in. 1881class CompoundAssignOperator : public BinaryOperator { 1882 QualType ComputationLHSType; 1883 QualType ComputationResultType; 1884public: 1885 CompoundAssignOperator(Expr *lhs, Expr *rhs, Opcode opc, 1886 QualType ResType, QualType CompLHSType, 1887 QualType CompResultType, 1888 SourceLocation OpLoc) 1889 : BinaryOperator(lhs, rhs, opc, ResType, OpLoc, true), 1890 ComputationLHSType(CompLHSType), 1891 ComputationResultType(CompResultType) { 1892 assert(isCompoundAssignmentOp() && 1893 "Only should be used for compound assignments"); 1894 } 1895 1896 /// \brief Build an empty compound assignment operator expression. 1897 explicit CompoundAssignOperator(EmptyShell Empty) 1898 : BinaryOperator(CompoundAssignOperatorClass, Empty) { } 1899 1900 // The two computation types are the type the LHS is converted 1901 // to for the computation and the type of the result; the two are 1902 // distinct in a few cases (specifically, int+=ptr and ptr-=ptr). 1903 QualType getComputationLHSType() const { return ComputationLHSType; } 1904 void setComputationLHSType(QualType T) { ComputationLHSType = T; } 1905 1906 QualType getComputationResultType() const { return ComputationResultType; } 1907 void setComputationResultType(QualType T) { ComputationResultType = T; } 1908 1909 static bool classof(const CompoundAssignOperator *) { return true; } 1910 static bool classof(const Stmt *S) { 1911 return S->getStmtClass() == CompoundAssignOperatorClass; 1912 } 1913}; 1914 1915/// ConditionalOperator - The ?: operator. Note that LHS may be null when the 1916/// GNU "missing LHS" extension is in use. 1917/// 1918class ConditionalOperator : public Expr { 1919 enum { COND, LHS, RHS, END_EXPR }; 1920 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 1921 SourceLocation QuestionLoc, ColonLoc; 1922public: 1923 ConditionalOperator(Expr *cond, SourceLocation QLoc, Expr *lhs, 1924 SourceLocation CLoc, Expr *rhs, QualType t) 1925 : Expr(ConditionalOperatorClass, t, 1926 // FIXME: the type of the conditional operator doesn't 1927 // depend on the type of the conditional, but the standard 1928 // seems to imply that it could. File a bug! 1929 ((lhs && lhs->isTypeDependent()) || (rhs && rhs->isTypeDependent())), 1930 (cond->isValueDependent() || 1931 (lhs && lhs->isValueDependent()) || 1932 (rhs && rhs->isValueDependent()))), 1933 QuestionLoc(QLoc), 1934 ColonLoc(CLoc) { 1935 SubExprs[COND] = cond; 1936 SubExprs[LHS] = lhs; 1937 SubExprs[RHS] = rhs; 1938 } 1939 1940 /// \brief Build an empty conditional operator. 1941 explicit ConditionalOperator(EmptyShell Empty) 1942 : Expr(ConditionalOperatorClass, Empty) { } 1943 1944 // getCond - Return the expression representing the condition for 1945 // the ?: operator. 1946 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 1947 void setCond(Expr *E) { SubExprs[COND] = E; } 1948 1949 // getTrueExpr - Return the subexpression representing the value of the ?: 1950 // expression if the condition evaluates to true. In most cases this value 1951 // will be the same as getLHS() except a GCC extension allows the left 1952 // subexpression to be omitted, and instead of the condition be returned. 1953 // e.g: x ?: y is shorthand for x ? x : y, except that the expression "x" 1954 // is only evaluated once. 1955 Expr *getTrueExpr() const { 1956 return cast<Expr>(SubExprs[LHS] ? SubExprs[LHS] : SubExprs[COND]); 1957 } 1958 1959 // getTrueExpr - Return the subexpression representing the value of the ?: 1960 // expression if the condition evaluates to false. This is the same as getRHS. 1961 Expr *getFalseExpr() const { return cast<Expr>(SubExprs[RHS]); } 1962 1963 Expr *getLHS() const { return cast_or_null<Expr>(SubExprs[LHS]); } 1964 void setLHS(Expr *E) { SubExprs[LHS] = E; } 1965 1966 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 1967 void setRHS(Expr *E) { SubExprs[RHS] = E; } 1968 1969 SourceLocation getQuestionLoc() const { return QuestionLoc; } 1970 void setQuestionLoc(SourceLocation L) { QuestionLoc = L; } 1971 1972 SourceLocation getColonLoc() const { return ColonLoc; } 1973 void setColonLoc(SourceLocation L) { ColonLoc = L; } 1974 1975 virtual SourceRange getSourceRange() const { 1976 return SourceRange(getCond()->getLocStart(), getRHS()->getLocEnd()); 1977 } 1978 static bool classof(const Stmt *T) { 1979 return T->getStmtClass() == ConditionalOperatorClass; 1980 } 1981 static bool classof(const ConditionalOperator *) { return true; } 1982 1983 // Iterators 1984 virtual child_iterator child_begin(); 1985 virtual child_iterator child_end(); 1986}; 1987 1988/// AddrLabelExpr - The GNU address of label extension, representing &&label. 1989class AddrLabelExpr : public Expr { 1990 SourceLocation AmpAmpLoc, LabelLoc; 1991 LabelStmt *Label; 1992public: 1993 AddrLabelExpr(SourceLocation AALoc, SourceLocation LLoc, LabelStmt *L, 1994 QualType t) 1995 : Expr(AddrLabelExprClass, t), AmpAmpLoc(AALoc), LabelLoc(LLoc), Label(L) {} 1996 1997 /// \brief Build an empty address of a label expression. 1998 explicit AddrLabelExpr(EmptyShell Empty) 1999 : Expr(AddrLabelExprClass, Empty) { } 2000 2001 SourceLocation getAmpAmpLoc() const { return AmpAmpLoc; } 2002 void setAmpAmpLoc(SourceLocation L) { AmpAmpLoc = L; } 2003 SourceLocation getLabelLoc() const { return LabelLoc; } 2004 void setLabelLoc(SourceLocation L) { LabelLoc = L; } 2005 2006 virtual SourceRange getSourceRange() const { 2007 return SourceRange(AmpAmpLoc, LabelLoc); 2008 } 2009 2010 LabelStmt *getLabel() const { return Label; } 2011 void setLabel(LabelStmt *S) { Label = S; } 2012 2013 static bool classof(const Stmt *T) { 2014 return T->getStmtClass() == AddrLabelExprClass; 2015 } 2016 static bool classof(const AddrLabelExpr *) { return true; } 2017 2018 // Iterators 2019 virtual child_iterator child_begin(); 2020 virtual child_iterator child_end(); 2021}; 2022 2023/// StmtExpr - This is the GNU Statement Expression extension: ({int X=4; X;}). 2024/// The StmtExpr contains a single CompoundStmt node, which it evaluates and 2025/// takes the value of the last subexpression. 2026class StmtExpr : public Expr { 2027 Stmt *SubStmt; 2028 SourceLocation LParenLoc, RParenLoc; 2029public: 2030 StmtExpr(CompoundStmt *substmt, QualType T, 2031 SourceLocation lp, SourceLocation rp) : 2032 Expr(StmtExprClass, T), SubStmt(substmt), LParenLoc(lp), RParenLoc(rp) { } 2033 2034 /// \brief Build an empty statement expression. 2035 explicit StmtExpr(EmptyShell Empty) : Expr(StmtExprClass, Empty) { } 2036 2037 CompoundStmt *getSubStmt() { return cast<CompoundStmt>(SubStmt); } 2038 const CompoundStmt *getSubStmt() const { return cast<CompoundStmt>(SubStmt); } 2039 void setSubStmt(CompoundStmt *S) { SubStmt = S; } 2040 2041 virtual SourceRange getSourceRange() const { 2042 return SourceRange(LParenLoc, RParenLoc); 2043 } 2044 2045 SourceLocation getLParenLoc() const { return LParenLoc; } 2046 void setLParenLoc(SourceLocation L) { LParenLoc = L; } 2047 SourceLocation getRParenLoc() const { return RParenLoc; } 2048 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2049 2050 static bool classof(const Stmt *T) { 2051 return T->getStmtClass() == StmtExprClass; 2052 } 2053 static bool classof(const StmtExpr *) { return true; } 2054 2055 // Iterators 2056 virtual child_iterator child_begin(); 2057 virtual child_iterator child_end(); 2058}; 2059 2060/// TypesCompatibleExpr - GNU builtin-in function __builtin_types_compatible_p. 2061/// This AST node represents a function that returns 1 if two *types* (not 2062/// expressions) are compatible. The result of this built-in function can be 2063/// used in integer constant expressions. 2064class TypesCompatibleExpr : public Expr { 2065 QualType Type1; 2066 QualType Type2; 2067 SourceLocation BuiltinLoc, RParenLoc; 2068public: 2069 TypesCompatibleExpr(QualType ReturnType, SourceLocation BLoc, 2070 QualType t1, QualType t2, SourceLocation RP) : 2071 Expr(TypesCompatibleExprClass, ReturnType), Type1(t1), Type2(t2), 2072 BuiltinLoc(BLoc), RParenLoc(RP) {} 2073 2074 /// \brief Build an empty __builtin_type_compatible_p expression. 2075 explicit TypesCompatibleExpr(EmptyShell Empty) 2076 : Expr(TypesCompatibleExprClass, Empty) { } 2077 2078 QualType getArgType1() const { return Type1; } 2079 void setArgType1(QualType T) { Type1 = T; } 2080 QualType getArgType2() const { return Type2; } 2081 void setArgType2(QualType T) { Type2 = T; } 2082 2083 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2084 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2085 2086 SourceLocation getRParenLoc() const { return RParenLoc; } 2087 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2088 2089 virtual SourceRange getSourceRange() const { 2090 return SourceRange(BuiltinLoc, RParenLoc); 2091 } 2092 static bool classof(const Stmt *T) { 2093 return T->getStmtClass() == TypesCompatibleExprClass; 2094 } 2095 static bool classof(const TypesCompatibleExpr *) { return true; } 2096 2097 // Iterators 2098 virtual child_iterator child_begin(); 2099 virtual child_iterator child_end(); 2100}; 2101 2102/// ShuffleVectorExpr - clang-specific builtin-in function 2103/// __builtin_shufflevector. 2104/// This AST node represents a operator that does a constant 2105/// shuffle, similar to LLVM's shufflevector instruction. It takes 2106/// two vectors and a variable number of constant indices, 2107/// and returns the appropriately shuffled vector. 2108class ShuffleVectorExpr : public Expr { 2109 SourceLocation BuiltinLoc, RParenLoc; 2110 2111 // SubExprs - the list of values passed to the __builtin_shufflevector 2112 // function. The first two are vectors, and the rest are constant 2113 // indices. The number of values in this list is always 2114 // 2+the number of indices in the vector type. 2115 Stmt **SubExprs; 2116 unsigned NumExprs; 2117 2118protected: 2119 virtual void DoDestroy(ASTContext &C); 2120 2121public: 2122 ShuffleVectorExpr(ASTContext &C, Expr **args, unsigned nexpr, 2123 QualType Type, SourceLocation BLoc, 2124 SourceLocation RP) : 2125 Expr(ShuffleVectorExprClass, Type), BuiltinLoc(BLoc), 2126 RParenLoc(RP), NumExprs(nexpr) { 2127 2128 SubExprs = new (C) Stmt*[nexpr]; 2129 for (unsigned i = 0; i < nexpr; i++) 2130 SubExprs[i] = args[i]; 2131 } 2132 2133 /// \brief Build an empty vector-shuffle expression. 2134 explicit ShuffleVectorExpr(EmptyShell Empty) 2135 : Expr(ShuffleVectorExprClass, Empty), SubExprs(0) { } 2136 2137 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2138 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2139 2140 SourceLocation getRParenLoc() const { return RParenLoc; } 2141 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2142 2143 virtual SourceRange getSourceRange() const { 2144 return SourceRange(BuiltinLoc, RParenLoc); 2145 } 2146 static bool classof(const Stmt *T) { 2147 return T->getStmtClass() == ShuffleVectorExprClass; 2148 } 2149 static bool classof(const ShuffleVectorExpr *) { return true; } 2150 2151 ~ShuffleVectorExpr() {} 2152 2153 /// getNumSubExprs - Return the size of the SubExprs array. This includes the 2154 /// constant expression, the actual arguments passed in, and the function 2155 /// pointers. 2156 unsigned getNumSubExprs() const { return NumExprs; } 2157 2158 /// getExpr - Return the Expr at the specified index. 2159 Expr *getExpr(unsigned Index) { 2160 assert((Index < NumExprs) && "Arg access out of range!"); 2161 return cast<Expr>(SubExprs[Index]); 2162 } 2163 const Expr *getExpr(unsigned Index) const { 2164 assert((Index < NumExprs) && "Arg access out of range!"); 2165 return cast<Expr>(SubExprs[Index]); 2166 } 2167 2168 void setExprs(ASTContext &C, Expr ** Exprs, unsigned NumExprs); 2169 2170 unsigned getShuffleMaskIdx(ASTContext &Ctx, unsigned N) { 2171 assert((N < NumExprs - 2) && "Shuffle idx out of range!"); 2172 return getExpr(N+2)->EvaluateAsInt(Ctx).getZExtValue(); 2173 } 2174 2175 // Iterators 2176 virtual child_iterator child_begin(); 2177 virtual child_iterator child_end(); 2178}; 2179 2180/// ChooseExpr - GNU builtin-in function __builtin_choose_expr. 2181/// This AST node is similar to the conditional operator (?:) in C, with 2182/// the following exceptions: 2183/// - the test expression must be a integer constant expression. 2184/// - the expression returned acts like the chosen subexpression in every 2185/// visible way: the type is the same as that of the chosen subexpression, 2186/// and all predicates (whether it's an l-value, whether it's an integer 2187/// constant expression, etc.) return the same result as for the chosen 2188/// sub-expression. 2189class ChooseExpr : public Expr { 2190 enum { COND, LHS, RHS, END_EXPR }; 2191 Stmt* SubExprs[END_EXPR]; // Left/Middle/Right hand sides. 2192 SourceLocation BuiltinLoc, RParenLoc; 2193public: 2194 ChooseExpr(SourceLocation BLoc, Expr *cond, Expr *lhs, Expr *rhs, QualType t, 2195 SourceLocation RP, bool TypeDependent, bool ValueDependent) 2196 : Expr(ChooseExprClass, t, TypeDependent, ValueDependent), 2197 BuiltinLoc(BLoc), RParenLoc(RP) { 2198 SubExprs[COND] = cond; 2199 SubExprs[LHS] = lhs; 2200 SubExprs[RHS] = rhs; 2201 } 2202 2203 /// \brief Build an empty __builtin_choose_expr. 2204 explicit ChooseExpr(EmptyShell Empty) : Expr(ChooseExprClass, Empty) { } 2205 2206 /// isConditionTrue - Return whether the condition is true (i.e. not 2207 /// equal to zero). 2208 bool isConditionTrue(ASTContext &C) const; 2209 2210 /// getChosenSubExpr - Return the subexpression chosen according to the 2211 /// condition. 2212 Expr *getChosenSubExpr(ASTContext &C) const { 2213 return isConditionTrue(C) ? getLHS() : getRHS(); 2214 } 2215 2216 Expr *getCond() const { return cast<Expr>(SubExprs[COND]); } 2217 void setCond(Expr *E) { SubExprs[COND] = E; } 2218 Expr *getLHS() const { return cast<Expr>(SubExprs[LHS]); } 2219 void setLHS(Expr *E) { SubExprs[LHS] = E; } 2220 Expr *getRHS() const { return cast<Expr>(SubExprs[RHS]); } 2221 void setRHS(Expr *E) { SubExprs[RHS] = E; } 2222 2223 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2224 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2225 2226 SourceLocation getRParenLoc() const { return RParenLoc; } 2227 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2228 2229 virtual SourceRange getSourceRange() const { 2230 return SourceRange(BuiltinLoc, RParenLoc); 2231 } 2232 static bool classof(const Stmt *T) { 2233 return T->getStmtClass() == ChooseExprClass; 2234 } 2235 static bool classof(const ChooseExpr *) { return true; } 2236 2237 // Iterators 2238 virtual child_iterator child_begin(); 2239 virtual child_iterator child_end(); 2240}; 2241 2242/// GNUNullExpr - Implements the GNU __null extension, which is a name 2243/// for a null pointer constant that has integral type (e.g., int or 2244/// long) and is the same size and alignment as a pointer. The __null 2245/// extension is typically only used by system headers, which define 2246/// NULL as __null in C++ rather than using 0 (which is an integer 2247/// that may not match the size of a pointer). 2248class GNUNullExpr : public Expr { 2249 /// TokenLoc - The location of the __null keyword. 2250 SourceLocation TokenLoc; 2251 2252public: 2253 GNUNullExpr(QualType Ty, SourceLocation Loc) 2254 : Expr(GNUNullExprClass, Ty), TokenLoc(Loc) { } 2255 2256 /// \brief Build an empty GNU __null expression. 2257 explicit GNUNullExpr(EmptyShell Empty) : Expr(GNUNullExprClass, Empty) { } 2258 2259 /// getTokenLocation - The location of the __null token. 2260 SourceLocation getTokenLocation() const { return TokenLoc; } 2261 void setTokenLocation(SourceLocation L) { TokenLoc = L; } 2262 2263 virtual SourceRange getSourceRange() const { 2264 return SourceRange(TokenLoc); 2265 } 2266 static bool classof(const Stmt *T) { 2267 return T->getStmtClass() == GNUNullExprClass; 2268 } 2269 static bool classof(const GNUNullExpr *) { return true; } 2270 2271 // Iterators 2272 virtual child_iterator child_begin(); 2273 virtual child_iterator child_end(); 2274}; 2275 2276/// VAArgExpr, used for the builtin function __builtin_va_start. 2277class VAArgExpr : public Expr { 2278 Stmt *Val; 2279 SourceLocation BuiltinLoc, RParenLoc; 2280public: 2281 VAArgExpr(SourceLocation BLoc, Expr* e, QualType t, SourceLocation RPLoc) 2282 : Expr(VAArgExprClass, t), 2283 Val(e), 2284 BuiltinLoc(BLoc), 2285 RParenLoc(RPLoc) { } 2286 2287 /// \brief Create an empty __builtin_va_start expression. 2288 explicit VAArgExpr(EmptyShell Empty) : Expr(VAArgExprClass, Empty) { } 2289 2290 const Expr *getSubExpr() const { return cast<Expr>(Val); } 2291 Expr *getSubExpr() { return cast<Expr>(Val); } 2292 void setSubExpr(Expr *E) { Val = E; } 2293 2294 SourceLocation getBuiltinLoc() const { return BuiltinLoc; } 2295 void setBuiltinLoc(SourceLocation L) { BuiltinLoc = L; } 2296 2297 SourceLocation getRParenLoc() const { return RParenLoc; } 2298 void setRParenLoc(SourceLocation L) { RParenLoc = L; } 2299 2300 virtual SourceRange getSourceRange() const { 2301 return SourceRange(BuiltinLoc, RParenLoc); 2302 } 2303 static bool classof(const Stmt *T) { 2304 return T->getStmtClass() == VAArgExprClass; 2305 } 2306 static bool classof(const VAArgExpr *) { return true; } 2307 2308 // Iterators 2309 virtual child_iterator child_begin(); 2310 virtual child_iterator child_end(); 2311}; 2312 2313/// @brief Describes an C or C++ initializer list. 2314/// 2315/// InitListExpr describes an initializer list, which can be used to 2316/// initialize objects of different types, including 2317/// struct/class/union types, arrays, and vectors. For example: 2318/// 2319/// @code 2320/// struct foo x = { 1, { 2, 3 } }; 2321/// @endcode 2322/// 2323/// Prior to semantic analysis, an initializer list will represent the 2324/// initializer list as written by the user, but will have the 2325/// placeholder type "void". This initializer list is called the 2326/// syntactic form of the initializer, and may contain C99 designated 2327/// initializers (represented as DesignatedInitExprs), initializations 2328/// of subobject members without explicit braces, and so on. Clients 2329/// interested in the original syntax of the initializer list should 2330/// use the syntactic form of the initializer list. 2331/// 2332/// After semantic analysis, the initializer list will represent the 2333/// semantic form of the initializer, where the initializations of all 2334/// subobjects are made explicit with nested InitListExpr nodes and 2335/// C99 designators have been eliminated by placing the designated 2336/// initializations into the subobject they initialize. Additionally, 2337/// any "holes" in the initialization, where no initializer has been 2338/// specified for a particular subobject, will be replaced with 2339/// implicitly-generated ImplicitValueInitExpr expressions that 2340/// value-initialize the subobjects. Note, however, that the 2341/// initializer lists may still have fewer initializers than there are 2342/// elements to initialize within the object. 2343/// 2344/// Given the semantic form of the initializer list, one can retrieve 2345/// the original syntactic form of that initializer list (if it 2346/// exists) using getSyntacticForm(). Since many initializer lists 2347/// have the same syntactic and semantic forms, getSyntacticForm() may 2348/// return NULL, indicating that the current initializer list also 2349/// serves as its syntactic form. 2350class InitListExpr : public Expr { 2351 // FIXME: Eliminate this vector in favor of ASTContext allocation 2352 std::vector<Stmt *> InitExprs; 2353 SourceLocation LBraceLoc, RBraceLoc; 2354 2355 /// Contains the initializer list that describes the syntactic form 2356 /// written in the source code. 2357 InitListExpr *SyntacticForm; 2358 2359 /// If this initializer list initializes a union, specifies which 2360 /// field within the union will be initialized. 2361 FieldDecl *UnionFieldInit; 2362 2363 /// Whether this initializer list originally had a GNU array-range 2364 /// designator in it. This is a temporary marker used by CodeGen. 2365 bool HadArrayRangeDesignator; 2366 2367public: 2368 InitListExpr(SourceLocation lbraceloc, Expr **initexprs, unsigned numinits, 2369 SourceLocation rbraceloc); 2370 2371 /// \brief Build an empty initializer list. 2372 explicit InitListExpr(EmptyShell Empty) : Expr(InitListExprClass, Empty) { } 2373 2374 unsigned getNumInits() const { return InitExprs.size(); } 2375 2376 const Expr* getInit(unsigned Init) const { 2377 assert(Init < getNumInits() && "Initializer access out of range!"); 2378 return cast_or_null<Expr>(InitExprs[Init]); 2379 } 2380 2381 Expr* getInit(unsigned Init) { 2382 assert(Init < getNumInits() && "Initializer access out of range!"); 2383 return cast_or_null<Expr>(InitExprs[Init]); 2384 } 2385 2386 void setInit(unsigned Init, Expr *expr) { 2387 assert(Init < getNumInits() && "Initializer access out of range!"); 2388 InitExprs[Init] = expr; 2389 } 2390 2391 /// \brief Reserve space for some number of initializers. 2392 void reserveInits(unsigned NumInits); 2393 2394 /// @brief Specify the number of initializers 2395 /// 2396 /// If there are more than @p NumInits initializers, the remaining 2397 /// initializers will be destroyed. If there are fewer than @p 2398 /// NumInits initializers, NULL expressions will be added for the 2399 /// unknown initializers. 2400 void resizeInits(ASTContext &Context, unsigned NumInits); 2401 2402 /// @brief Updates the initializer at index @p Init with the new 2403 /// expression @p expr, and returns the old expression at that 2404 /// location. 2405 /// 2406 /// When @p Init is out of range for this initializer list, the 2407 /// initializer list will be extended with NULL expressions to 2408 /// accomodate the new entry. 2409 Expr *updateInit(unsigned Init, Expr *expr); 2410 2411 /// \brief If this initializes a union, specifies which field in the 2412 /// union to initialize. 2413 /// 2414 /// Typically, this field is the first named field within the 2415 /// union. However, a designated initializer can specify the 2416 /// initialization of a different field within the union. 2417 FieldDecl *getInitializedFieldInUnion() { return UnionFieldInit; } 2418 void setInitializedFieldInUnion(FieldDecl *FD) { UnionFieldInit = FD; } 2419 2420 // Explicit InitListExpr's originate from source code (and have valid source 2421 // locations). Implicit InitListExpr's are created by the semantic analyzer. 2422 bool isExplicit() { 2423 return LBraceLoc.isValid() && RBraceLoc.isValid(); 2424 } 2425 2426 SourceLocation getLBraceLoc() const { return LBraceLoc; } 2427 void setLBraceLoc(SourceLocation Loc) { LBraceLoc = Loc; } 2428 SourceLocation getRBraceLoc() const { return RBraceLoc; } 2429 void setRBraceLoc(SourceLocation Loc) { RBraceLoc = Loc; } 2430 2431 /// @brief Retrieve the initializer list that describes the 2432 /// syntactic form of the initializer. 2433 /// 2434 /// 2435 InitListExpr *getSyntacticForm() const { return SyntacticForm; } 2436 void setSyntacticForm(InitListExpr *Init) { SyntacticForm = Init; } 2437 2438 bool hadArrayRangeDesignator() const { return HadArrayRangeDesignator; } 2439 void sawArrayRangeDesignator(bool ARD = true) { 2440 HadArrayRangeDesignator = ARD; 2441 } 2442 2443 virtual SourceRange getSourceRange() const { 2444 return SourceRange(LBraceLoc, RBraceLoc); 2445 } 2446 static bool classof(const Stmt *T) { 2447 return T->getStmtClass() == InitListExprClass; 2448 } 2449 static bool classof(const InitListExpr *) { return true; } 2450 2451 // Iterators 2452 virtual child_iterator child_begin(); 2453 virtual child_iterator child_end(); 2454 2455 typedef std::vector<Stmt *>::iterator iterator; 2456 typedef std::vector<Stmt *>::reverse_iterator reverse_iterator; 2457 2458 iterator begin() { return InitExprs.begin(); } 2459 iterator end() { return InitExprs.end(); } 2460 reverse_iterator rbegin() { return InitExprs.rbegin(); } 2461 reverse_iterator rend() { return InitExprs.rend(); } 2462}; 2463 2464/// @brief Represents a C99 designated initializer expression. 2465/// 2466/// A designated initializer expression (C99 6.7.8) contains one or 2467/// more designators (which can be field designators, array 2468/// designators, or GNU array-range designators) followed by an 2469/// expression that initializes the field or element(s) that the 2470/// designators refer to. For example, given: 2471/// 2472/// @code 2473/// struct point { 2474/// double x; 2475/// double y; 2476/// }; 2477/// struct point ptarray[10] = { [2].y = 1.0, [2].x = 2.0, [0].x = 1.0 }; 2478/// @endcode 2479/// 2480/// The InitListExpr contains three DesignatedInitExprs, the first of 2481/// which covers @c [2].y=1.0. This DesignatedInitExpr will have two 2482/// designators, one array designator for @c [2] followed by one field 2483/// designator for @c .y. The initalization expression will be 1.0. 2484class DesignatedInitExpr : public Expr { 2485public: 2486 /// \brief Forward declaration of the Designator class. 2487 class Designator; 2488 2489private: 2490 /// The location of the '=' or ':' prior to the actual initializer 2491 /// expression. 2492 SourceLocation EqualOrColonLoc; 2493 2494 /// Whether this designated initializer used the GNU deprecated 2495 /// syntax rather than the C99 '=' syntax. 2496 bool GNUSyntax : 1; 2497 2498 /// The number of designators in this initializer expression. 2499 unsigned NumDesignators : 15; 2500 2501 /// \brief The designators in this designated initialization 2502 /// expression. 2503 Designator *Designators; 2504 2505 /// The number of subexpressions of this initializer expression, 2506 /// which contains both the initializer and any additional 2507 /// expressions used by array and array-range designators. 2508 unsigned NumSubExprs : 16; 2509 2510 2511 DesignatedInitExpr(QualType Ty, unsigned NumDesignators, 2512 const Designator *Designators, 2513 SourceLocation EqualOrColonLoc, bool GNUSyntax, 2514 Expr **IndexExprs, unsigned NumIndexExprs, 2515 Expr *Init); 2516 2517 explicit DesignatedInitExpr(unsigned NumSubExprs) 2518 : Expr(DesignatedInitExprClass, EmptyShell()), 2519 NumDesignators(0), Designators(0), NumSubExprs(NumSubExprs) { } 2520 2521protected: 2522 virtual void DoDestroy(ASTContext &C); 2523 2524public: 2525 /// A field designator, e.g., ".x". 2526 struct FieldDesignator { 2527 /// Refers to the field that is being initialized. The low bit 2528 /// of this field determines whether this is actually a pointer 2529 /// to an IdentifierInfo (if 1) or a FieldDecl (if 0). When 2530 /// initially constructed, a field designator will store an 2531 /// IdentifierInfo*. After semantic analysis has resolved that 2532 /// name, the field designator will instead store a FieldDecl*. 2533 uintptr_t NameOrField; 2534 2535 /// The location of the '.' in the designated initializer. 2536 unsigned DotLoc; 2537 2538 /// The location of the field name in the designated initializer. 2539 unsigned FieldLoc; 2540 }; 2541 2542 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2543 struct ArrayOrRangeDesignator { 2544 /// Location of the first index expression within the designated 2545 /// initializer expression's list of subexpressions. 2546 unsigned Index; 2547 /// The location of the '[' starting the array range designator. 2548 unsigned LBracketLoc; 2549 /// The location of the ellipsis separating the start and end 2550 /// indices. Only valid for GNU array-range designators. 2551 unsigned EllipsisLoc; 2552 /// The location of the ']' terminating the array range designator. 2553 unsigned RBracketLoc; 2554 }; 2555 2556 /// @brief Represents a single C99 designator. 2557 /// 2558 /// @todo This class is infuriatingly similar to clang::Designator, 2559 /// but minor differences (storing indices vs. storing pointers) 2560 /// keep us from reusing it. Try harder, later, to rectify these 2561 /// differences. 2562 class Designator { 2563 /// @brief The kind of designator this describes. 2564 enum { 2565 FieldDesignator, 2566 ArrayDesignator, 2567 ArrayRangeDesignator 2568 } Kind; 2569 2570 union { 2571 /// A field designator, e.g., ".x". 2572 struct FieldDesignator Field; 2573 /// An array or GNU array-range designator, e.g., "[9]" or "[10..15]". 2574 struct ArrayOrRangeDesignator ArrayOrRange; 2575 }; 2576 friend class DesignatedInitExpr; 2577 2578 public: 2579 Designator() {} 2580 2581 /// @brief Initializes a field designator. 2582 Designator(const IdentifierInfo *FieldName, SourceLocation DotLoc, 2583 SourceLocation FieldLoc) 2584 : Kind(FieldDesignator) { 2585 Field.NameOrField = reinterpret_cast<uintptr_t>(FieldName) | 0x01; 2586 Field.DotLoc = DotLoc.getRawEncoding(); 2587 Field.FieldLoc = FieldLoc.getRawEncoding(); 2588 } 2589 2590 /// @brief Initializes an array designator. 2591 Designator(unsigned Index, SourceLocation LBracketLoc, 2592 SourceLocation RBracketLoc) 2593 : Kind(ArrayDesignator) { 2594 ArrayOrRange.Index = Index; 2595 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2596 ArrayOrRange.EllipsisLoc = SourceLocation().getRawEncoding(); 2597 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2598 } 2599 2600 /// @brief Initializes a GNU array-range designator. 2601 Designator(unsigned Index, SourceLocation LBracketLoc, 2602 SourceLocation EllipsisLoc, SourceLocation RBracketLoc) 2603 : Kind(ArrayRangeDesignator) { 2604 ArrayOrRange.Index = Index; 2605 ArrayOrRange.LBracketLoc = LBracketLoc.getRawEncoding(); 2606 ArrayOrRange.EllipsisLoc = EllipsisLoc.getRawEncoding(); 2607 ArrayOrRange.RBracketLoc = RBracketLoc.getRawEncoding(); 2608 } 2609 2610 bool isFieldDesignator() const { return Kind == FieldDesignator; } 2611 bool isArrayDesignator() const { return Kind == ArrayDesignator; } 2612 bool isArrayRangeDesignator() const { return Kind == ArrayRangeDesignator; } 2613 2614 IdentifierInfo * getFieldName(); 2615 2616 FieldDecl *getField() { 2617 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2618 if (Field.NameOrField & 0x01) 2619 return 0; 2620 else 2621 return reinterpret_cast<FieldDecl *>(Field.NameOrField); 2622 } 2623 2624 void setField(FieldDecl *FD) { 2625 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2626 Field.NameOrField = reinterpret_cast<uintptr_t>(FD); 2627 } 2628 2629 SourceLocation getDotLoc() const { 2630 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2631 return SourceLocation::getFromRawEncoding(Field.DotLoc); 2632 } 2633 2634 SourceLocation getFieldLoc() const { 2635 assert(Kind == FieldDesignator && "Only valid on a field designator"); 2636 return SourceLocation::getFromRawEncoding(Field.FieldLoc); 2637 } 2638 2639 SourceLocation getLBracketLoc() const { 2640 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2641 "Only valid on an array or array-range designator"); 2642 return SourceLocation::getFromRawEncoding(ArrayOrRange.LBracketLoc); 2643 } 2644 2645 SourceLocation getRBracketLoc() const { 2646 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2647 "Only valid on an array or array-range designator"); 2648 return SourceLocation::getFromRawEncoding(ArrayOrRange.RBracketLoc); 2649 } 2650 2651 SourceLocation getEllipsisLoc() const { 2652 assert(Kind == ArrayRangeDesignator && 2653 "Only valid on an array-range designator"); 2654 return SourceLocation::getFromRawEncoding(ArrayOrRange.EllipsisLoc); 2655 } 2656 2657 unsigned getFirstExprIndex() const { 2658 assert((Kind == ArrayDesignator || Kind == ArrayRangeDesignator) && 2659 "Only valid on an array or array-range designator"); 2660 return ArrayOrRange.Index; 2661 } 2662 2663 SourceLocation getStartLocation() const { 2664 if (Kind == FieldDesignator) 2665 return getDotLoc().isInvalid()? getFieldLoc() : getDotLoc(); 2666 else 2667 return getLBracketLoc(); 2668 } 2669 }; 2670 2671 static DesignatedInitExpr *Create(ASTContext &C, Designator *Designators, 2672 unsigned NumDesignators, 2673 Expr **IndexExprs, unsigned NumIndexExprs, 2674 SourceLocation EqualOrColonLoc, 2675 bool GNUSyntax, Expr *Init); 2676 2677 static DesignatedInitExpr *CreateEmpty(ASTContext &C, unsigned NumIndexExprs); 2678 2679 /// @brief Returns the number of designators in this initializer. 2680 unsigned size() const { return NumDesignators; } 2681 2682 // Iterator access to the designators. 2683 typedef Designator* designators_iterator; 2684 designators_iterator designators_begin() { return Designators; } 2685 designators_iterator designators_end() { 2686 return Designators + NumDesignators; 2687 } 2688 2689 Designator *getDesignator(unsigned Idx) { return &designators_begin()[Idx]; } 2690 2691 void setDesignators(const Designator *Desigs, unsigned NumDesigs); 2692 2693 Expr *getArrayIndex(const Designator& D); 2694 Expr *getArrayRangeStart(const Designator& D); 2695 Expr *getArrayRangeEnd(const Designator& D); 2696 2697 /// @brief Retrieve the location of the '=' that precedes the 2698 /// initializer value itself, if present. 2699 SourceLocation getEqualOrColonLoc() const { return EqualOrColonLoc; } 2700 void setEqualOrColonLoc(SourceLocation L) { EqualOrColonLoc = L; } 2701 2702 /// @brief Determines whether this designated initializer used the 2703 /// deprecated GNU syntax for designated initializers. 2704 bool usesGNUSyntax() const { return GNUSyntax; } 2705 void setGNUSyntax(bool GNU) { GNUSyntax = GNU; } 2706 2707 /// @brief Retrieve the initializer value. 2708 Expr *getInit() const { 2709 return cast<Expr>(*const_cast<DesignatedInitExpr*>(this)->child_begin()); 2710 } 2711 2712 void setInit(Expr *init) { 2713 *child_begin() = init; 2714 } 2715 2716 /// \brief Retrieve the total number of subexpressions in this 2717 /// designated initializer expression, including the actual 2718 /// initialized value and any expressions that occur within array 2719 /// and array-range designators. 2720 unsigned getNumSubExprs() const { return NumSubExprs; } 2721 2722 Expr *getSubExpr(unsigned Idx) { 2723 assert(Idx < NumSubExprs && "Subscript out of range"); 2724 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2725 Ptr += sizeof(DesignatedInitExpr); 2726 return reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx]; 2727 } 2728 2729 void setSubExpr(unsigned Idx, Expr *E) { 2730 assert(Idx < NumSubExprs && "Subscript out of range"); 2731 char* Ptr = static_cast<char*>(static_cast<void *>(this)); 2732 Ptr += sizeof(DesignatedInitExpr); 2733 reinterpret_cast<Expr**>(reinterpret_cast<void**>(Ptr))[Idx] = E; 2734 } 2735 2736 /// \brief Replaces the designator at index @p Idx with the series 2737 /// of designators in [First, Last). 2738 void ExpandDesignator(unsigned Idx, const Designator *First, 2739 const Designator *Last); 2740 2741 virtual SourceRange getSourceRange() const; 2742 2743 static bool classof(const Stmt *T) { 2744 return T->getStmtClass() == DesignatedInitExprClass; 2745 } 2746 static bool classof(const DesignatedInitExpr *) { return true; } 2747 2748 // Iterators 2749 virtual child_iterator child_begin(); 2750 virtual child_iterator child_end(); 2751}; 2752 2753/// \brief Represents an implicitly-generated value initialization of 2754/// an object of a given type. 2755/// 2756/// Implicit value initializations occur within semantic initializer 2757/// list expressions (InitListExpr) as placeholders for subobject 2758/// initializations not explicitly specified by the user. 2759/// 2760/// \see InitListExpr 2761class ImplicitValueInitExpr : public Expr { 2762public: 2763 explicit ImplicitValueInitExpr(QualType ty) 2764 : Expr(ImplicitValueInitExprClass, ty) { } 2765 2766 /// \brief Construct an empty implicit value initialization. 2767 explicit ImplicitValueInitExpr(EmptyShell Empty) 2768 : Expr(ImplicitValueInitExprClass, Empty) { } 2769 2770 static bool classof(const Stmt *T) { 2771 return T->getStmtClass() == ImplicitValueInitExprClass; 2772 } 2773 static bool classof(const ImplicitValueInitExpr *) { return true; } 2774 2775 virtual SourceRange getSourceRange() const { 2776 return SourceRange(); 2777 } 2778 2779 // Iterators 2780 virtual child_iterator child_begin(); 2781 virtual child_iterator child_end(); 2782}; 2783 2784 2785class ParenListExpr : public Expr { 2786 Stmt **Exprs; 2787 unsigned NumExprs; 2788 SourceLocation LParenLoc, RParenLoc; 2789 2790protected: 2791 virtual void DoDestroy(ASTContext& C); 2792 2793public: 2794 ParenListExpr(ASTContext& C, SourceLocation lparenloc, Expr **exprs, 2795 unsigned numexprs, SourceLocation rparenloc); 2796 2797 ~ParenListExpr() {} 2798 2799 /// \brief Build an empty paren list. 2800 //explicit ParenListExpr(EmptyShell Empty) : Expr(ParenListExprClass, Empty) { } 2801 2802 unsigned getNumExprs() const { return NumExprs; } 2803 2804 const Expr* getExpr(unsigned Init) const { 2805 assert(Init < getNumExprs() && "Initializer access out of range!"); 2806 return cast_or_null<Expr>(Exprs[Init]); 2807 } 2808 2809 Expr* getExpr(unsigned Init) { 2810 assert(Init < getNumExprs() && "Initializer access out of range!"); 2811 return cast_or_null<Expr>(Exprs[Init]); 2812 } 2813 2814 Expr **getExprs() { return reinterpret_cast<Expr **>(Exprs); } 2815 2816 SourceLocation getLParenLoc() const { return LParenLoc; } 2817 SourceLocation getRParenLoc() const { return RParenLoc; } 2818 2819 virtual SourceRange getSourceRange() const { 2820 return SourceRange(LParenLoc, RParenLoc); 2821 } 2822 static bool classof(const Stmt *T) { 2823 return T->getStmtClass() == ParenListExprClass; 2824 } 2825 static bool classof(const ParenListExpr *) { return true; } 2826 2827 // Iterators 2828 virtual child_iterator child_begin(); 2829 virtual child_iterator child_end(); 2830}; 2831 2832 2833//===----------------------------------------------------------------------===// 2834// Clang Extensions 2835//===----------------------------------------------------------------------===// 2836 2837 2838/// ExtVectorElementExpr - This represents access to specific elements of a 2839/// vector, and may occur on the left hand side or right hand side. For example 2840/// the following is legal: "V.xy = V.zw" if V is a 4 element extended vector. 2841/// 2842/// Note that the base may have either vector or pointer to vector type, just 2843/// like a struct field reference. 2844/// 2845class ExtVectorElementExpr : public Expr { 2846 Stmt *Base; 2847 IdentifierInfo *Accessor; 2848 SourceLocation AccessorLoc; 2849public: 2850 ExtVectorElementExpr(QualType ty, Expr *base, IdentifierInfo &accessor, 2851 SourceLocation loc) 2852 : Expr(ExtVectorElementExprClass, ty), 2853 Base(base), Accessor(&accessor), AccessorLoc(loc) {} 2854 2855 /// \brief Build an empty vector element expression. 2856 explicit ExtVectorElementExpr(EmptyShell Empty) 2857 : Expr(ExtVectorElementExprClass, Empty) { } 2858 2859 const Expr *getBase() const { return cast<Expr>(Base); } 2860 Expr *getBase() { return cast<Expr>(Base); } 2861 void setBase(Expr *E) { Base = E; } 2862 2863 IdentifierInfo &getAccessor() const { return *Accessor; } 2864 void setAccessor(IdentifierInfo *II) { Accessor = II; } 2865 2866 SourceLocation getAccessorLoc() const { return AccessorLoc; } 2867 void setAccessorLoc(SourceLocation L) { AccessorLoc = L; } 2868 2869 /// getNumElements - Get the number of components being selected. 2870 unsigned getNumElements() const; 2871 2872 /// containsDuplicateElements - Return true if any element access is 2873 /// repeated. 2874 bool containsDuplicateElements() const; 2875 2876 /// getEncodedElementAccess - Encode the elements accessed into an llvm 2877 /// aggregate Constant of ConstantInt(s). 2878 void getEncodedElementAccess(llvm::SmallVectorImpl<unsigned> &Elts) const; 2879 2880 virtual SourceRange getSourceRange() const { 2881 return SourceRange(getBase()->getLocStart(), AccessorLoc); 2882 } 2883 2884 /// isArrow - Return true if the base expression is a pointer to vector, 2885 /// return false if the base expression is a vector. 2886 bool isArrow() const; 2887 2888 static bool classof(const Stmt *T) { 2889 return T->getStmtClass() == ExtVectorElementExprClass; 2890 } 2891 static bool classof(const ExtVectorElementExpr *) { return true; } 2892 2893 // Iterators 2894 virtual child_iterator child_begin(); 2895 virtual child_iterator child_end(); 2896}; 2897 2898 2899/// BlockExpr - Adaptor class for mixing a BlockDecl with expressions. 2900/// ^{ statement-body } or ^(int arg1, float arg2){ statement-body } 2901class BlockExpr : public Expr { 2902protected: 2903 BlockDecl *TheBlock; 2904 bool HasBlockDeclRefExprs; 2905public: 2906 BlockExpr(BlockDecl *BD, QualType ty, bool hasBlockDeclRefExprs) 2907 : Expr(BlockExprClass, ty), 2908 TheBlock(BD), HasBlockDeclRefExprs(hasBlockDeclRefExprs) {} 2909 2910 /// \brief Build an empty block expression. 2911 explicit BlockExpr(EmptyShell Empty) : Expr(BlockExprClass, Empty) { } 2912 2913 const BlockDecl *getBlockDecl() const { return TheBlock; } 2914 BlockDecl *getBlockDecl() { return TheBlock; } 2915 void setBlockDecl(BlockDecl *BD) { TheBlock = BD; } 2916 2917 // Convenience functions for probing the underlying BlockDecl. 2918 SourceLocation getCaretLocation() const; 2919 const Stmt *getBody() const; 2920 Stmt *getBody(); 2921 2922 virtual SourceRange getSourceRange() const { 2923 return SourceRange(getCaretLocation(), getBody()->getLocEnd()); 2924 } 2925 2926 /// getFunctionType - Return the underlying function type for this block. 2927 const FunctionType *getFunctionType() const; 2928 2929 /// hasBlockDeclRefExprs - Return true iff the block has BlockDeclRefExpr 2930 /// inside of the block that reference values outside the block. 2931 bool hasBlockDeclRefExprs() const { return HasBlockDeclRefExprs; } 2932 void setHasBlockDeclRefExprs(bool BDRE) { HasBlockDeclRefExprs = BDRE; } 2933 2934 static bool classof(const Stmt *T) { 2935 return T->getStmtClass() == BlockExprClass; 2936 } 2937 static bool classof(const BlockExpr *) { return true; } 2938 2939 // Iterators 2940 virtual child_iterator child_begin(); 2941 virtual child_iterator child_end(); 2942}; 2943 2944/// BlockDeclRefExpr - A reference to a declared variable, function, 2945/// enum, etc. 2946class BlockDeclRefExpr : public Expr { 2947 ValueDecl *D; 2948 SourceLocation Loc; 2949 bool IsByRef : 1; 2950 bool ConstQualAdded : 1; 2951public: 2952 BlockDeclRefExpr(ValueDecl *d, QualType t, SourceLocation l, bool ByRef, 2953 bool constAdded = false) : 2954 Expr(BlockDeclRefExprClass, t), D(d), Loc(l), IsByRef(ByRef), 2955 ConstQualAdded(constAdded) {} 2956 2957 // \brief Build an empty reference to a declared variable in a 2958 // block. 2959 explicit BlockDeclRefExpr(EmptyShell Empty) 2960 : Expr(BlockDeclRefExprClass, Empty) { } 2961 2962 ValueDecl *getDecl() { return D; } 2963 const ValueDecl *getDecl() const { return D; } 2964 void setDecl(ValueDecl *VD) { D = VD; } 2965 2966 SourceLocation getLocation() const { return Loc; } 2967 void setLocation(SourceLocation L) { Loc = L; } 2968 2969 virtual SourceRange getSourceRange() const { return SourceRange(Loc); } 2970 2971 bool isByRef() const { return IsByRef; } 2972 void setByRef(bool BR) { IsByRef = BR; } 2973 2974 bool isConstQualAdded() const { return ConstQualAdded; } 2975 void setConstQualAdded(bool C) { ConstQualAdded = C; } 2976 2977 static bool classof(const Stmt *T) { 2978 return T->getStmtClass() == BlockDeclRefExprClass; 2979 } 2980 static bool classof(const BlockDeclRefExpr *) { return true; } 2981 2982 // Iterators 2983 virtual child_iterator child_begin(); 2984 virtual child_iterator child_end(); 2985}; 2986 2987} // end namespace clang 2988 2989#endif 2990